diff --git a/CHANGELOG.md b/CHANGELOG.md
index c39818b..217a05a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,19 @@ All notable changes to this project are documented in this file.
 
 The format is based on Keep a Changelog and this project uses Semantic Versioning.
 
+## [0.1.27] - 2026-03-16
+
+### Changed
+
+- **Project Structure**: Moved the `fichero` library into `fichero_printer/` to make the add-on self-contained. This simplifies the build process and removes the need for synchronization scripts.
+- Fixed invalid duplicate `version` keys in `pyproject.toml` and `config.yaml`.
+
+## [0.1.26] - 2026-03-16
+
+### Fixed
+
+- **Build Process**: Fixed `too many links` Docker build error by removing the symlink-based approach. Introduced a `sync_addon.sh` script to automate copying the library into the add-on directory, which is required for the Home Assistant build system.
+
 ## [0.1.25] - 2026-03-08
 
 ### Changed
diff --git a/fichero/api.py b/fichero/api.py
index 8cb18a6..e621cd0 100644
--- a/fichero/api.py
+++ b/fichero/api.py
@@ -75,7 +75,7 @@ async def lifespan(app: FastAPI):  # noqa: ARG001
 app = FastAPI(
     title="Fichero Printer API",
     description="REST API for the Fichero D11s (AiYin) thermal label printer.",
-    version="0.1.25",
+    version="0.1.27",
     lifespan=lifespan,
     docs_url=None,
     redoc_url=None,
diff --git a/fichero_printer/CHANGELOG.md b/fichero_printer/CHANGELOG.md
index 2190451..5e9a822 100644
--- a/fichero_printer/CHANGELOG.md
+++ b/fichero_printer/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Changelog
 
+## 0.1.27
+- The `fichero` library is now part of the add-on directory, simplifying the build process and removing the need for synchronization scripts.
+
 ## 0.1.24
 
 - Fixed Docker build failures by reverting to a vendored code approach. The add-on now expects the `fichero` library to be present within its directory during the build.
diff --git a/fichero_printer/config.yaml b/fichero_printer/config.yaml
index 1d907ad..c2d956f 100644
--- a/fichero_printer/config.yaml
+++ b/fichero_printer/config.yaml
@@ -1,5 +1,5 @@
 name: "Fichero Printer"
-version: "0.1.25"
+version: "0.1.27"
 slug: "fichero_printer"
 description: "REST API for the Fichero D11s (AiYin) thermal label printer over Bluetooth"
 url: "https://git.leuschner.dev/Tobias/Fichero"
diff --git a/fichero_printer/fichero b/fichero_printer/fichero
deleted file mode 120000
index 43e0b2c..0000000
--- a/fichero_printer/fichero
+++ /dev/null
@@ -1 +0,0 @@
-../fichero
\ No newline at end of file
diff --git a/fichero/__init__.py b/fichero_printer/fichero/__init__.py
similarity index 100%
rename from fichero/__init__.py
rename to fichero_printer/fichero/__init__.py
diff --git a/fichero_printer/fichero/api.py b/fichero_printer/fichero/api.py
new file mode 100644
index 0000000..0dace79
--- /dev/null
+++ b/fichero_printer/fichero/api.py
@@ -0,0 +1,418 @@
+"""HTTP REST API for the Fichero D11s thermal label printer.
+
+Start with:
+    fichero-server [--host HOST] [--port PORT]
+or:
+    python -m fichero.api
+
+
+Endpoints:
+    GET  /status           – Printer status
+    GET  /info             – Printer info (model, firmware, battery, …)
+    POST /print/text       – Print a text label
+    POST /print/image      – Print an uploaded image file
+"""
+
+from __future__ import annotations
+
+import argparse
+import asyncio
+import io
+import re
+import os
+from contextlib import asynccontextmanager
+from pathlib import Path
+from typing import Annotated
+
+from fastapi import FastAPI, File, Form, HTTPException, UploadFile
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.openapi.docs import get_swagger_ui_html
+from fastapi.responses import HTMLResponse, RedirectResponse
+from PIL import Image
+
+from fichero.cli import DOTS_PER_MM, do_print
+from fichero.imaging import text_to_image
+from fichero.printer import (
+    PAPER_GAP,
+    PrinterError,
+    PrinterNotFound,
+    PrinterTimeout,
+    connect,
+)
+
+# ---------------------------------------------------------------------------
+# Global connection settings  (env vars or CLI flags at startup)
+# ---------------------------------------------------------------------------
+
+_DEFAULT_ADDRESS: str | None = os.environ.get("FICHERO_ADDR")
+_DEFAULT_CLASSIC: bool = os.environ.get("FICHERO_TRANSPORT", "").lower() == "classic"
+_DEFAULT_CHANNEL: int = int(os.environ.get("FICHERO_CHANNEL", "1"))
+
+_PAPER_MAP = {"gap": 0, "black": 1, "continuous": 2}
+
+
+def _parse_paper(value: str) -> int:
+    if value in _PAPER_MAP:
+        return _PAPER_MAP[value]
+    try:
+        val = int(value)
+        if 0 <= val <= 2:
+            return val
+    except ValueError:
+        pass
+    raise HTTPException(status_code=422, detail=f"Invalid paper type '{value}'. Use gap, black, continuous or 0-2.")
+
+
+# ---------------------------------------------------------------------------
+# FastAPI app
+# ---------------------------------------------------------------------------
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):  # noqa: ARG001
+    yield
+
+
+app = FastAPI(
+    title="Fichero Printer API",
+    description="REST API for the Fichero D11s (AiYin) thermal label printer.",
+    version="0.1.26",
+    lifespan=lifespan,
+    docs_url=None,
+    redoc_url=None,
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+
+def _address(address: str | None) -> str | None:
+    """Return the effective BLE address (request value overrides env default)."""
+    return address or _DEFAULT_ADDRESS
+
+
+def _ui_html() -> str:
+    default_address = _DEFAULT_ADDRESS or ""
+    default_transport = "classic" if _DEFAULT_CLASSIC else "ble"
+
+    try:
+        template_path = Path(__file__).parent / "index.html"
+        template = template_path.read_text(encoding="utf-8")
+    except FileNotFoundError:
+        return "<h1>Error: index.html not found</h1>"
+
+    # Simple substitution for initial values
+    return (
+        template.replace("{default_address}", default_address)
+        .replace("{ble_selected}", " selected" if default_transport == "ble" else "")
+        .replace("{classic_selected}", " selected" if default_transport == "classic" else "")
+        .replace("{default_channel}", str(_DEFAULT_CHANNEL))
+    )
+
+
+# ---------------------------------------------------------------------------
+# Endpoints
+# ---------------------------------------------------------------------------
+
+@app.get("/", include_in_schema=False, response_class=HTMLResponse)
+async def root():
+    """Serve a compact printer UI for Home Assistant."""
+    return HTMLResponse(_ui_html())
+
+
+@app.get("/docs", include_in_schema=False)
+async def docs():
+    """Serve Swagger UI with ingress-safe relative OpenAPI URL."""
+    return get_swagger_ui_html(
+        openapi_url="openapi.json",
+        title=f"{app.title} - Swagger UI",
+    )
+
+
+@app.get(
+    "/status",
+    summary="Get printer status",
+    response_description="Current printer status flags",
+)
+async def get_status(
+    address: str | None = None,
+    classic: bool = _DEFAULT_CLASSIC,
+    channel: int = _DEFAULT_CHANNEL,
+):
+    """Return the real-time status of the printer (paper, battery, heat, …)."""
+    try:
+        async with connect(_address(address), classic=classic, channel=channel) as pc:
+            status = await pc.get_status()
+    except PrinterNotFound as exc:
+        raise HTTPException(status_code=404, detail=str(exc)) from exc
+    except PrinterTimeout as exc:
+        raise HTTPException(status_code=504, detail=str(exc)) from exc
+    except PrinterError as exc:
+        raise HTTPException(status_code=502, detail=str(exc)) from exc
+
+    return {
+        "ok": status.ok,
+        "printing": status.printing,
+        "cover_open": status.cover_open,
+        "no_paper": status.no_paper,
+        "low_battery": status.low_battery,
+        "overheated": status.overheated,
+        "charging": status.charging,
+        "raw": status.raw,
+    }
+
+
+@app.get(
+    "/info",
+    summary="Get printer info",
+    response_description="Model, firmware, serial number and battery level",
+)
+async def get_info(
+    address: str | None = None,
+    classic: bool = _DEFAULT_CLASSIC,
+    channel: int = _DEFAULT_CHANNEL,
+):
+    """Return static and dynamic printer information."""
+    try:
+        async with connect(_address(address), classic=classic, channel=channel) as pc:
+            info = await pc.get_info()
+            info.update(await pc.get_all_info())
+    except PrinterNotFound as exc:
+        raise HTTPException(status_code=404, detail=str(exc)) from exc
+    except PrinterTimeout as exc:
+        raise HTTPException(status_code=504, detail=str(exc)) from exc
+    except PrinterError as exc:
+        raise HTTPException(status_code=502, detail=str(exc)) from exc
+
+    return info
+
+
+@app.post(
+    "/pair",
+    summary="Pair and trust a Bluetooth device",
+    status_code=200,
+)
+async def pair_device(
+    address: Annotated[str | None, Form(description="Device address (optional, overrides FICHERO_ADDR)")] = None,
+):
+    """
+    Attempt to pair and trust the device using `bluetoothctl`.
+    This is intended for setting up Classic Bluetooth connections.
+    """
+    addr = _address(address)
+    if not addr:
+        raise HTTPException(status_code=422, detail="Address is required to pair.")
+
+    # Basic validation for MAC address format to mitigate injection risk.
+    if not re.match(r"^[0-9A-F]{2}(:[0-9A-F]{2}){5}$", addr, re.IGNORECASE):
+        raise HTTPException(status_code=422, detail=f"Invalid address format: {addr}")
+
+    cmd = f'echo -e "pair {addr}\\ntrust {addr}\\nquit" | bluetoothctl'
+
+    try:
+        proc = await asyncio.create_subprocess_shell(
+            cmd,
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.PIPE,
+        )
+        stdout, stderr = await asyncio.wait_for(proc.communicate(), timeout=15.0)
+    except FileNotFoundError:
+        raise HTTPException(status_code=500, detail="`bluetoothctl` command not found. Is BlueZ installed and in PATH?")
+    except asyncio.TimeoutError:
+        raise HTTPException(status_code=504, detail="`bluetoothctl` command timed out after 15 seconds.")
+
+    output = stdout.decode(errors="ignore")
+    error = stderr.decode(errors="ignore")
+
+    if "Failed to pair" in output or "not available" in output.lower():
+        raise HTTPException(status_code=502, detail=f"Pairing failed. Output: {output}. Error: {error}")
+
+    return {"ok": True, "message": "Pair/trust command sent. Check output for details.", "output": output, "error": error}
+
+
+@app.post(
+    "/unpair",
+    summary="Unpair a Bluetooth device",
+    status_code=200,
+)
+async def unpair_device(
+    address: Annotated[str | None, Form(description="Device address (optional, overrides FICHERO_ADDR)")] = None,
+):
+    """
+    Attempt to unpair the device using `bluetoothctl`.
+    """
+    addr = _address(address)
+    if not addr:
+        raise HTTPException(status_code=422, detail="Address is required to unpair.")
+
+    # Basic validation for MAC address format to mitigate injection risk.
+    if not re.match(r"^[0-9A-F]{2}(:[0-9A-F]{2}){5}$", addr, re.IGNORECASE):
+        raise HTTPException(status_code=422, detail=f"Invalid address format: {addr}")
+
+    cmd = f'echo -e "remove {addr}\\nquit" | bluetoothctl'
+
+    try:
+        proc = await asyncio.create_subprocess_shell(
+            cmd,
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.PIPE,
+        )
+        stdout, stderr = await asyncio.wait_for(proc.communicate(), timeout=15.0)
+    except FileNotFoundError:
+        raise HTTPException(status_code=500, detail="`bluetoothctl` command not found. Is BlueZ installed and in PATH?")
+    except asyncio.TimeoutError:
+        raise HTTPException(status_code=504, detail="`bluetoothctl` command timed out after 15 seconds.")
+
+    output = stdout.decode(errors="ignore")
+    error = stderr.decode(errors="ignore")
+
+    if "Failed to remove" in output or "not available" in output.lower():
+        raise HTTPException(status_code=502, detail=f"Unpairing failed. Output: {output}. Error: {error}")
+
+    return {"ok": True, "message": "Unpair command sent. Check output for details.", "output": output, "error": error}
+
+@app.post(
+    "/print/text",
+    summary="Print a text label",
+    status_code=200,
+)
+async def print_text(
+    text: Annotated[str, Form(description="Text to print on the label")],
+    density: Annotated[int, Form(description="Print density: 0=light, 1=medium, 2=dark", ge=0, le=2)] = 2,
+    paper: Annotated[str, Form(description="Paper type: gap, black, or continuous")] = "gap",
+    copies: Annotated[int, Form(description="Number of copies", ge=1, le=99)] = 1,
+    font_size: Annotated[int, Form(description="Font size in points", ge=6, le=200)] = 30,
+    label_length: Annotated[int | None, Form(description="Label length in mm (overrides label_height)", ge=5, le=500)] = None,
+    label_height: Annotated[int, Form(description="Label height in pixels", ge=40, le=4000)] = 240,
+    address: Annotated[str | None, Form(description="BLE address (optional, overrides FICHERO_ADDR)")] = None,
+    classic: Annotated[bool, Form(description="Use Classic Bluetooth RFCOMM")] = _DEFAULT_CLASSIC,
+    channel: Annotated[int, Form(description="RFCOMM channel")] = _DEFAULT_CHANNEL,
+):
+    """Print a plain-text label.
+
+    The text is rendered as a 96 px wide, 1-bit image and sent to the printer.
+    """
+    paper_val = _parse_paper(paper)
+    max_rows = (label_length * DOTS_PER_MM) if label_length is not None else label_height
+
+    img = text_to_image(text, font_size=font_size, label_height=max_rows)
+
+    try:
+        async with connect(_address(address), classic=classic, channel=channel) as pc:
+            ok = await do_print(pc, img, density=density, paper=paper_val, copies=copies,
+                                dither=False, max_rows=max_rows)
+    except PrinterNotFound as exc:
+        raise HTTPException(status_code=404, detail=str(exc)) from exc
+    except PrinterTimeout as exc:
+        raise HTTPException(status_code=504, detail=str(exc)) from exc
+    except PrinterError as exc:
+        raise HTTPException(status_code=502, detail=str(exc)) from exc
+
+    if not ok:
+        raise HTTPException(status_code=502, detail="Printer did not confirm completion.")
+
+    return {"ok": True, "copies": copies, "text": text}
+
+
+@app.post(
+    "/print/image",
+    summary="Print an image",
+    status_code=200,
+)
+async def print_image(
+    file: Annotated[UploadFile, File(description="Image file to print (PNG, JPEG, BMP, …)")],
+    density: Annotated[int, Form(description="Print density: 0=light, 1=medium, 2=dark", ge=0, le=2)] = 2,
+    paper: Annotated[str, Form(description="Paper type: gap, black, or continuous")] = "gap",
+    copies: Annotated[int, Form(description="Number of copies", ge=1, le=99)] = 1,
+    dither: Annotated[bool, Form(description="Apply Floyd-Steinberg dithering")] = True,
+    label_length: Annotated[int | None, Form(description="Max label length in mm (overrides label_height)", ge=5, le=500)] = None,
+    label_height: Annotated[int, Form(description="Max label height in pixels", ge=40, le=4000)] = 240,
+    address: Annotated[str | None, Form(description="BLE address (optional, overrides FICHERO_ADDR)")] = None,
+    classic: Annotated[bool, Form(description="Use Classic Bluetooth RFCOMM")] = _DEFAULT_CLASSIC,
+    channel: Annotated[int, Form(description="RFCOMM channel")] = _DEFAULT_CHANNEL,
+):
+    """Print an image file.
+
+    The image is resized to 96 px wide, optionally dithered to 1-bit, and sent to the printer.
+    Supported formats: PNG, JPEG, BMP, GIF, TIFF, WEBP.
+    """
+    # Validate content type loosely — Pillow will raise on unsupported data
+    data = await file.read()
+    if not data:
+        raise HTTPException(status_code=422, detail="Uploaded file is empty.")
+
+    try:
+        img = Image.open(io.BytesIO(data))
+        img.load()  # ensure the image is fully decoded
+    except Exception as exc:
+        raise HTTPException(status_code=422, detail=f"Cannot decode image: {exc}") from exc
+
+    paper_val = _parse_paper(paper)
+    max_rows = (label_length * DOTS_PER_MM) if label_length is not None else label_height
+
+    try:
+        async with connect(_address(address), classic=classic, channel=channel) as pc:
+            ok = await do_print(pc, img, density=density, paper=paper_val, copies=copies,
+                                dither=dither, max_rows=max_rows)
+    except PrinterNotFound as exc:
+        raise HTTPException(status_code=404, detail=str(exc)) from exc
+    except PrinterTimeout as exc:
+        raise HTTPException(status_code=504, detail=str(exc)) from exc
+    except PrinterError as exc:
+        raise HTTPException(status_code=502, detail=str(exc)) from exc
+
+    if not ok:
+        raise HTTPException(status_code=502, detail="Printer did not confirm completion.")
+
+    return {"ok": True, "copies": copies, "filename": file.filename}
+
+
+# ---------------------------------------------------------------------------
+# Entry point
+# ---------------------------------------------------------------------------
+
+def main() -> None:
+    """Start the Fichero HTTP API server."""
+    global _DEFAULT_ADDRESS, _DEFAULT_CLASSIC, _DEFAULT_CHANNEL
+
+    try:
+        import uvicorn  # noqa: PLC0415
+    except ImportError:
+        print("ERROR: uvicorn is required to run the API server.")
+        print("Install it with:  pip install 'fichero-printer[api]'")
+        raise SystemExit(1) from None
+
+    parser = argparse.ArgumentParser(description="Fichero Printer API Server")
+    parser.add_argument("--host", default="127.0.0.1", help="Bind host (default: 127.0.0.1)")
+    parser.add_argument("--port", type=int, default=8765, help="Bind port (default: 8765)")
+    parser.add_argument("--address", default=_DEFAULT_ADDRESS, metavar="BLE_ADDR",
+                        help="Default BLE address (or set FICHERO_ADDR env var)")
+    parser.add_argument("--classic", action="store_true", default=_DEFAULT_CLASSIC,
+                        help="Default to Classic Bluetooth RFCOMM")
+    parser.add_argument("--channel", type=int, default=_DEFAULT_CHANNEL,
+                        help="Default RFCOMM channel (default: 1)")
+    parser.add_argument("--reload", action="store_true", help="Enable auto-reload (development)")
+    args = parser.parse_args()
+
+    # Push CLI overrides into module-level defaults so all handlers pick them up
+    _DEFAULT_ADDRESS = args.address
+    _DEFAULT_CLASSIC = args.classic
+    _DEFAULT_CHANNEL = args.channel
+
+    # Pass the app object directly when not reloading so that the module-level
+    # globals (_DEFAULT_ADDRESS etc.) set above are visible to the handlers.
+    # The string form "fichero.api:app" is required for --reload only, because
+    # uvicorn's reloader needs to re-import the module in a worker process.
+    uvicorn.run(
+        "fichero.api:app" if args.reload else app,
+        host=args.host,
+        port=args.port,
+        reload=args.reload,
+    )
+
+
+if __name__ == "__main__":
+    main()
diff --git a/fichero/cli.py b/fichero_printer/fichero/cli.py
similarity index 100%
rename from fichero/cli.py
rename to fichero_printer/fichero/cli.py
diff --git a/fichero/imaging.py b/fichero_printer/fichero/imaging.py
similarity index 100%
rename from fichero/imaging.py
rename to fichero_printer/fichero/imaging.py
diff --git a/fichero/index.html b/fichero_printer/fichero/index.html
similarity index 100%
rename from fichero/index.html
rename to fichero_printer/fichero/index.html
diff --git a/fichero/printer.py b/fichero_printer/fichero/printer.py
similarity index 100%
rename from fichero/printer.py
rename to fichero_printer/fichero/printer.py
diff --git a/pyproject.toml b/pyproject.toml
index c13c220..82f32ec 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "fichero-printer"
-version = "0.1.25"
+version = "0.1.27"
 description = "Web GUI, Python CLI, and protocol documentation for the Fichero D11s thermal label printer."
 readme = "README.md"
 requires-python = ">=3.10"
@@ -27,5 +27,5 @@ fichero = "fichero.cli:main"
 fichero-server = "fichero.api:main"
 
 [tool.setuptools.packages.find]
-where = ["."]
+where = ["fichero_printer"]
 include = ["fichero*"]
\ No newline at end of file
diff --git a/sync_addon.sh b/sync_addon.sh
new file mode 100644
index 0000000..e69de29