feat: 实现微信公众号新闻和视频同步服务

- 使用 draft API 同步文章（适配个人订阅号）
- 使用 material API 同步视频（含详情获取）
- 自动建表（videos）、UPSERT 已有 articles 表
- 同步删除：微信端删除的素材自动从数据库移除
- APScheduler 定时调度，支持 --once 手动触发
- Docker + docker-compose 部署配置

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

main.py

@@ -0,0 +1,62 @@
+import argparse
+import logging
+import sys
+
+from apscheduler.schedulers.blocking import BlockingScheduler
+
+import config
+from db import Database
+from sync import SyncService
+from wechat import WeChatClient
+
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
+    datefmt="%Y-%m-%d %H:%M:%S",
+)
+logger = logging.getLogger(__name__)
+
+
+def main():
+    parser = argparse.ArgumentParser(description="UpdateDB - sync WeChat materials to database")
+    parser.add_argument("--once", action="store_true", help="Run sync once and exit")
+    args = parser.parse_args()
+
+    logger.info("UpdateDB starting (sync interval: %dh)", config.SYNC_INTERVAL_HOURS)
+
+    db = Database()
+    wechat = WeChatClient()
+    sync = SyncService(wechat, db)
+
+    try:
+        db.ensure_tables()
+
+        # Run once at startup
+        sync.run_sync()
+
+        if args.once:
+            logger.info("--once flag set, exiting after first sync")
+            return
+
+        scheduler = BlockingScheduler()
+        scheduler.add_job(
+            sync.run_sync,
+            "interval",
+            hours=config.SYNC_INTERVAL_HOURS,
+            id="sync_job",
+            max_instances=1,
+        )
+        logger.info("Scheduler started, next sync in %d hours", config.SYNC_INTERVAL_HOURS)
+        scheduler.start()
+    except KeyboardInterrupt:
+        logger.info("Shutting down")
+    except Exception as e:
+        logger.error("Fatal error: %s", e, exc_info=True)
+        sys.exit(1)
+    finally:
+        wechat.close()
+        db.close()
+
+
+if __name__ == "__main__":
+    main()