Add Reddit monitoring bot — backend, frontend, and Docker config

Python/FastAPI backend with PostgreSQL for collecting Reddit data via
public .json endpoints. React/Vite dashboard for analytics. Docker Compose
setup with API and worker services connecting to shared PostgreSQL.

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

backend/database.py

@@ -0,0 +1,18 @@
+from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine, AsyncSession
+from collections.abc import AsyncGenerator
+
+from backend.config import settings
+
+engine = create_async_engine(
+    settings.database_url,
+    pool_size=5,
+    max_overflow=10,
+    pool_recycle=3600,
+)
+
+async_session = async_sessionmaker(engine, expire_on_commit=False)
+
+
+async def get_db() -> AsyncGenerator[AsyncSession, None]:
+    async with async_session() as session:
+        yield session