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/routers/health.py

@@ -0,0 +1,16 @@
+from fastapi import APIRouter, Depends
+from sqlalchemy import text
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from backend.database import get_db
+
+router = APIRouter()
+
+
+@router.get("/health")
+async def health_check(db: AsyncSession = Depends(get_db)):
+    try:
+        await db.execute(text("SELECT 1"))
+        return {"status": "ok", "db": "connected"}
+    except Exception:
+        return {"status": "degraded", "db": "disconnected"}