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/subreddits.py

@@ -0,0 +1,47 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from backend.database import get_db
+from backend.schemas.subreddit import SubredditCreate, SubredditUpdate, SubredditResponse
+from backend.services import subreddit_service
+
+router = APIRouter(prefix="/subreddits", tags=["subreddits"])
+
+
+@router.get("", response_model=list[SubredditResponse])
+async def list_subreddits(db: AsyncSession = Depends(get_db)):
+    return await subreddit_service.list_subreddits(db)
+
+
+@router.post("", response_model=SubredditResponse, status_code=201)
+async def create_subreddit(body: SubredditCreate, db: AsyncSession = Depends(get_db)):
+    sub = await subreddit_service.create_subreddit(db, body.name)
+    data = {c.name: getattr(sub, c.name) for c in sub.__table__.columns}
+    data["post_count"] = 0
+    return data
+
+
+@router.get("/{subreddit_id}", response_model=SubredditResponse)
+async def get_subreddit(subreddit_id: int, db: AsyncSession = Depends(get_db)):
+    sub = await subreddit_service.get_subreddit(db, subreddit_id)
+    if not sub:
+        raise HTTPException(status_code=404, detail="Subreddit not found")
+    return sub
+
+
+@router.patch("/{subreddit_id}", response_model=SubredditResponse)
+async def update_subreddit(
+    subreddit_id: int, body: SubredditUpdate, db: AsyncSession = Depends(get_db)
+):
+    sub = await subreddit_service.update_subreddit(db, subreddit_id, body.is_active)
+    if not sub:
+        raise HTTPException(status_code=404, detail="Subreddit not found")
+    result = await subreddit_service.get_subreddit(db, subreddit_id)
+    return result
+
+
+@router.delete("/{subreddit_id}", status_code=204)
+async def delete_subreddit(subreddit_id: int, db: AsyncSession = Depends(get_db)):
+    deleted = await subreddit_service.delete_subreddit(db, subreddit_id)
+    if not deleted:
+        raise HTTPException(status_code=404, detail="Subreddit not found")