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/comments.py

@@ -0,0 +1,33 @@
+from datetime import datetime
+from fastapi import APIRouter, Depends, Query
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from backend.database import get_db
+from backend.services import comment_service
+
+router = APIRouter(prefix="/comments", tags=["comments"])
+
+
+@router.get("")
+async def list_comments(
+    post_id: int | None = None,
+    subreddit_id: int | None = None,
+    author: str | None = None,
+    sort_by: str = Query("created_utc", pattern="^(created_utc|score)$"),
+    sort_order: str = Query("desc", pattern="^(asc|desc)$"),
+    since: datetime | None = None,
+    until: datetime | None = None,
+    page: int = Query(1, ge=1),
+    per_page: int = Query(25, ge=1, le=100),
+    db: AsyncSession = Depends(get_db),
+):
+    comments, total = await comment_service.list_comments(
+        db, post_id, subreddit_id, author, sort_by, sort_order, since, until, page, per_page
+    )
+    return {
+        "data": comments,
+        "total": total,
+        "page": page,
+        "per_page": per_page,
+        "pages": (total + per_page - 1) // per_page if per_page else 0,
+    }