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/summaries.py

@@ -0,0 +1,13 @@
+from fastapi import APIRouter
+
+router = APIRouter(prefix="/summaries", tags=["summaries"])
+
+
+@router.get("")
+async def list_summaries():
+    return {"data": [], "message": "AI summaries not yet configured"}
+
+
+@router.get("/{summary_id}")
+async def get_summary(summary_id: int):
+    return {"detail": "AI summaries not yet configured"}