Add docker-compose support with data persistence

- Add docker-compose.yml for easy deployment
- Configure DB_PATH environment variable for flexible database location
- Mount ./data volume for data persistence across container restarts

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

database.py

@@ -1,9 +1,10 @@
 import sqlite3
+import os
 from datetime import datetime, date
 from typing import List, Optional
 from pydantic import BaseModel
 
-DB_NAME = "news.db"
+DB_NAME = os.environ.get("DB_PATH", "news.db")
 
 class Article(BaseModel):
     title: str