feat: wire database init and seeding into app startup

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

app/main.py

@@ -10,11 +10,14 @@ import structlog
 from fastapi import FastAPI
 from fastapi.staticfiles import StaticFiles
 from fastapi.templating import Jinja2Templates
+from sqlmodel import SQLModel, Session
 
 from app.config import get_settings
+from app.database import get_engine, get_db_session
 from app.logging_config import setup_logging
 from app.routes.health import router as health_router
 from app.routes.pages import router as pages_router
+from app.services.seed_service import SeedService
 
 logger = structlog.get_logger(__name__)
 
@@ -50,6 +53,24 @@ def create_app() -> FastAPI:
     app.include_router(health_router)
     app.include_router(pages_router)
 
+    # Database setup
+    engine = get_engine(settings.database_url)
+    SQLModel.metadata.create_all(engine)
+    app.state.engine = engine
+
+    # DB session dependency for routes
+    def _get_session():
+        yield from get_db_session(engine)
+
+    app.dependency_overrides[get_db_session] = _get_session
+
+    # Seed database on startup
+    @app.on_event("startup")
+    async def on_startup():
+        with Session(engine) as session:
+            seed_service = SeedService(session)
+            seed_service.seed_all()
+
     logger.info("app_started", environment=settings.app_env)
 
     return app