feat: interactive inline buttons, SMTP reply, AI reply suggestions

- Inline keyboard: view original / back to summary toggle per message
- SMTP config per account for sending replies
- Reply button: click, type message, auto-send via SMTP
- AI Reply button: generates 3 suggestions via DeepSeek
  - Simple replies (OK, Got it) send immediately on tap
  - Substantive replies require confirm before send
  - Hides AI Reply button when AI determines reply unnecessary
- Telegram long polling integrated into main loop for real-time interaction

main.py

@@ -4,6 +4,7 @@ import sys
 import time
 from src.config import load_config
 from src.summarizer import process_all
+from src.tg_bot import poll_telegram
 
 logging.basicConfig(
     level=logging.INFO,
@@ -30,17 +31,22 @@ def main():
     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")
 
+    last_check = 0.0
+    last_update_id = 0
+
     while _running:
         try:
-            process_all(cfg)
+            now = time.time()
+            if now - last_check >= cfg.polling.interval_seconds:
+                process_all(cfg)
+                last_check = now
+
+            last_update_id = poll_telegram(cfg.telegram, cfg, last_update_id)
         except Exception as e:
-            logger.error(f"轮询出错: {e}", exc_info=True)
+            logger.error(f"主循环出错: {e}", exc_info=True)
 
         if _running:
-            for _ in range(cfg.polling.interval_seconds):
-                if not _running:
-                    break
-                time.sleep(1)
+            time.sleep(1)
 
     logger.info("机器人已停止")