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/models/session.py

@@ -0,0 +1,46 @@
+import uuid
+from datetime import datetime
+from sqlalchemy import String, Float, Boolean, DateTime, Text, ForeignKey
+from sqlalchemy.orm import Mapped, mapped_column
+from sqlalchemy.dialects.sqlite import JSON
+from ..database import Base
+
+
+class PlaybackSession(Base):
+    __tablename__ = "playback_sessions"
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
+    user_id: Mapped[str] = mapped_column(String(36), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    library_item_id: Mapped[str] = mapped_column(String(36), ForeignKey("library_items.id", ondelete="CASCADE"), nullable=False)
+    episode_id: Mapped[str | None] = mapped_column(String(36), nullable=True)
+    media_type: Mapped[str] = mapped_column(String(20), default="book")
+    current_time: Mapped[float] = mapped_column(Float, default=0.0)
+    duration: Mapped[float] = mapped_column(Float, default=0.0)
+    device_id: Mapped[str | None] = mapped_column(String(255), nullable=True)
+    device_info: Mapped[dict] = mapped_column(JSON, default=dict)
+    media_player: Mapped[str | None] = mapped_column(String(100), nullable=True)
+    started_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
+    hls_session_path: Mapped[str | None] = mapped_column(Text, nullable=True)
+
+
+class ServerSetting(Base):
+    __tablename__ = "server_settings"
+
+    key: Mapped[str] = mapped_column(String(100), primary_key=True)
+    value: Mapped[dict | list | str | bool | int | float | None] = mapped_column(JSON, nullable=True)
+    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+
+class ScanJob(Base):
+    __tablename__ = "scan_jobs"
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
+    library_id: Mapped[str] = mapped_column(String(36), ForeignKey("libraries.id", ondelete="CASCADE"), nullable=False)
+    status: Mapped[str] = mapped_column(String(20), default="queued")  # queued/running/done/error
+    progress: Mapped[float] = mapped_column(Float, default=0.0)
+    items_found: Mapped[int] = mapped_column(default=0)
+    started_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
+    finished_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
+    log: Mapped[str | None] = mapped_column(Text, nullable=True)