Initial commit: Phase 1 – Projektstruktur, DB-Schema, Core-API

- FastAPI-Backend mit vollständiger ABS v2.x API-Kompatibilität
- SQLAlchemy-Models: User, Library, LibraryItem, BookFile, Chapter,
  Podcast, PodcastEpisode, MediaProgress, Bookmark, PlaybackSession
- Auth: JWT-Login (/login, /logout, /api/authorize)
- Library + Items Endpoints inkl. camelCase ABS-Response-Format
- HLS-Streaming via FFmpeg (POST /api/items/:id/play, Session-Sync)
- Me/Progress Endpoints + Lesezeichen
- User-Management + Server-Settings (Admin)
- Library-Scanner (MP3/WAV Discovery, Hintergrund-Task)
- File Watcher (watchdog, 30s Debounce)
- Matching-Skelett (MusicBrainz, OpenLibrary, Google Books – Phase 5)
- Docker-Setup: backend (Python 3.12+FFmpeg), frontend (React/Vite),
  nginx Reverse-Proxy auf Port 3000
- setup.sh: Installiert Docker auf Debian/Ubuntu, richtet .env ein

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/routers/settings.py

@@ -0,0 +1,53 @@
+from fastapi import APIRouter, Depends
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select
+from datetime import datetime
+from ..dependencies import get_db, get_current_user, require_admin
+from ..models.user import User
+from ..models.session import ServerSetting
+from ..config import get_settings
+
+router = APIRouter(prefix="/api/settings", tags=["settings"])
+
+DEFAULT_SETTINGS = {
+    "autoMatchBooks": True,
+    "autoMatchPodcasts": True,
+    "matchSources": ["musicbrainz", "open_library", "google_books"],
+    "podcastUpdateIntervalHours": 24,
+    "coverAspectRatio": 1,
+    "disableOpds": False,
+    "logLevel": 2,
+    "version": "2.4.0",
+    "buildNumber": 1,
+}
+
+
+@router.get("")
+async def get_settings_endpoint(
+    current_user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    result = await db.execute(select(ServerSetting))
+    rows = result.scalars().all()
+    settings_dict = {**DEFAULT_SETTINGS}
+    for row in rows:
+        settings_dict[row.key] = row.value
+    return settings_dict
+
+
+@router.patch("")
+async def update_settings(
+    body: dict,
+    admin: User = Depends(require_admin),
+    db: AsyncSession = Depends(get_db),
+):
+    for key, value in body.items():
+        result = await db.execute(select(ServerSetting).where(ServerSetting.key == key))
+        setting = result.scalar_one_or_none()
+        if setting:
+            setting.value = value
+            setting.updated_at = datetime.utcnow()
+        else:
+            db.add(ServerSetting(key=key, value=value))
+    await db.commit()
+    return {"success": True}