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/schemas/analytics.py

@@ -0,0 +1,54 @@
+from datetime import datetime, date
+from pydantic import BaseModel
+
+
+class EngagementPoint(BaseModel):
+    period: str
+    posts: int
+    comments: int
+    avg_score: float
+
+
+class TopPost(BaseModel):
+    id: int
+    title: str
+    score: int
+    num_comments: int
+    author_name: str | None
+    subreddit_name: str
+    created_utc: datetime
+    permalink: str | None
+
+
+class TopAuthor(BaseModel):
+    id: int
+    username: str
+    post_count: int
+    comment_count: int
+    total_activity: int
+
+
+class SubredditSummary(BaseModel):
+    subreddit_id: int
+    subreddit_name: str
+    total_posts: int
+    total_comments: int
+    avg_score: float
+    top_flair: str | None
+
+
+class FlairCount(BaseModel):
+    flair: str | None
+    count: int
+
+
+class DigestResponse(BaseModel):
+    id: int
+    subreddit_id: int
+    subreddit_name: str | None = None
+    digest_date: date
+    content: str
+    metadata_: dict | None = None
+    generated_at: datetime
+
+    model_config = {"from_attributes": True}