feat: init AI email summarization bot

- Multi-account IMAP email polling with UID tracking
- DeepSeek API integration with JSON Mode structured output
- Telegram notification with formatted MarkdownV2 message
- YAML config with dataclass-based type validation
- Graceful shutdown on SIGINT/SIGTERM
- 60s default polling interval

main.py

@@ -0,0 +1,49 @@
+import logging
+import signal
+import sys
+import time
+from src.config import load_config
+from src.summarizer import process_all
+
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
+    datefmt="%Y-%m-%d %H:%M:%S",
+)
+logger = logging.getLogger("main")
+
+_running = True
+
+
+def _signal_handler(signum, frame):
+    global _running
+    logger.info("收到退出信号，正在停止...")
+    _running = False
+
+
+def main():
+    global _running
+    signal.signal(signal.SIGINT, _signal_handler)
+    signal.signal(signal.SIGTERM, _signal_handler)
+
+    cfg_path = sys.argv[1] if len(sys.argv) > 1 else "config.yaml"
+    cfg = load_config(cfg_path)
+    logger.info(f"AI邮件摘要机器人已启动，轮询间隔: {cfg.polling.interval_seconds}s")
+
+    while _running:
+        try:
+            process_all(cfg)
+        except Exception as e:
+            logger.error(f"轮询出错: {e}", exc_info=True)
+
+        if _running:
+            for _ in range(cfg.polling.interval_seconds):
+                if not _running:
+                    break
+                time.sleep(1)
+
+    logger.info("机器人已停止")
+
+
+if __name__ == "__main__":
+    main()