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/post.py

@@ -0,0 +1,45 @@
+from datetime import datetime
+from pydantic import BaseModel
+
+
+class PostResponse(BaseModel):
+    id: int
+    reddit_id: str
+    subreddit_id: int
+    subreddit_name: str | None = None
+    author_id: int | None
+    author_name: str | None = None
+    title: str
+    selftext: str | None
+    url: str | None
+    permalink: str | None
+    flair: str | None
+    score: int
+    upvote_ratio: float | None
+    num_comments: int
+    is_self: bool | None
+    over_18: bool
+    hot_rank: int | None
+    created_utc: datetime
+    collected_at: datetime
+    updated_at: datetime
+
+    model_config = {"from_attributes": True}
+
+
+class PostDetailResponse(PostResponse):
+    comments: list["CommentResponse"] = []
+
+
+class CommentResponse(BaseModel):
+    id: int
+    reddit_id: str
+    post_id: int
+    parent_comment_id: int | None
+    author_id: int | None
+    author_name: str | None = None
+    body: str
+    score: int
+    created_utc: datetime
+
+    model_config = {"from_attributes": True}