feat: indie status page MVP -- FastAPI + SQLite

- 8 DB models (services, incidents, monitors, subscribers, etc.)
- Full CRUD API for services, incidents, monitors
- Public status page with live data
- Incident detail page with timeline
- API key authentication
- Uptime monitoring scheduler
- 13 tests passing
- TECHNICAL_DESIGN.md with full spec

app/dependencies.py

@@ -0,0 +1,26 @@
+from fastapi import Depends, Header, HTTPException, status
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.config import settings
+from app.database import async_session_factory
+
+
+async def get_db() -> AsyncSession:
+    """FastAPI dependency that yields an async database session."""
+    async with async_session_factory() as session:
+        try:
+            yield session
+            await session.commit()
+        except Exception:
+            await session.rollback()
+            raise
+
+
+async def verify_api_key(x_api_key: str = Header(...)) -> str:
+    """Validate the X-API-Key header against the configured admin key."""
+    if x_api_key != settings.admin_api_key:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Invalid API key",
+        )
+    return x_api_key