Initial commit: Video metadata registration service

- Add FastAPI server for video metadata registration
- PostgreSQL database models for videos, video_streams, audio_streams, subtitle_streams
- Batch registration script for .probe.json files
- RESTful API endpoints for CRUD operations
- Search functionality by title, artist, codec, resolution

app/database.py

@@ -0,0 +1,17 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, declarative_base
+from app.config import get_settings
+
+settings = get_settings()
+
+engine = create_engine(settings.database_url, echo=False)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+Base = declarative_base()
+
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()