feat: Add comment system and outlets data to News API

- Add comment models and service with CRUD operations
- Add comment endpoints (GET, POST, count)
- Add outlets-extracted.json with people/topics/companies data
- Fix database connection in comment_service to use centralized get_database()

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

services/news-api/backend/app/models/comment.py

@@ -0,0 +1,22 @@
+from pydantic import BaseModel, Field
+from typing import Optional
+from datetime import datetime
+
+class CommentBase(BaseModel):
+    articleId: str
+    nickname: str
+    content: str
+
+class CommentCreate(CommentBase):
+    pass
+
+class Comment(CommentBase):
+    id: str
+    createdAt: datetime
+
+    class Config:
+        from_attributes = True
+
+class CommentList(BaseModel):
+    comments: list[Comment]
+    total: int