feat: AI并行处理 + 修复邮件丢失

- _ai_processor 改用 ThreadPoolExecutor(5 workers) 并行调用AI
- _tg_worker 每轮排空所有待发TG消息(原来每轮只取1条)
- fetch_unseen_emails 单封FETCH失败不再丢弃整个批次，跳过继续

main.py

@@ -5,6 +5,7 @@ import signal
 import sys
 import threading
 import time
+from concurrent.futures import ThreadPoolExecutor
 from src.config import load_config
 from src.summarizer import poll_accounts, ai_process, tg_send_and_mark
 from src.tg_bot import poll_telegram
@@ -64,14 +65,24 @@ def _email_poller(cfg):
 
 
 def _ai_processor(cfg):
-    logger.info("AI 处理线程已启动")
+    logger.info("AI 处理线程已启动 (并行 workers=5)")
+    max_workers = 5
+    with ThreadPoolExecutor(max_workers=max_workers) as executor:
+        pending_futures = {}
         while _running:
+            while len(pending_futures) < max_workers:
                 try:
-            acct_idx, mail = _email_queue.get(timeout=1)
+                    acct_idx, mail = _email_queue.get_nowait()
                 except queue_module.Empty:
-            continue
+                    break
+                future = executor.submit(ai_process, cfg, acct_idx, mail)
+                pending_futures[future] = (acct_idx, mail)
+
+            completed = [f for f in pending_futures if f.done()]
+            for future in completed:
+                acct_idx, mail = pending_futures.pop(future)
                 try:
-            info = ai_process(cfg, acct_idx, mail)
+                    info = future.result()
                     if info:
                         _tg_queue.put(info)
                 except Exception as e:
@@ -80,6 +91,8 @@ def _ai_processor(cfg):
                     with _pending_lock:
                         _pending_uids.discard(mail.uid)
 
+            time.sleep(0.1 if pending_futures else 0.5)
+
 
 def _tg_worker(cfg):
     logger.info("TG 线程已启动")
@@ -90,11 +103,12 @@ def _tg_worker(cfg):
         except Exception as e:
             logger.error(f"TG 轮询错误: {e}", exc_info=True)
 
+        while _running:
             try:
                 info = _tg_queue.get_nowait()
                 tg_send_and_mark(cfg, info)
             except queue_module.Empty:
-            pass
+                break
             except Exception as e:
                 logger.error(f"TG 发送失败: {e}", exc_info=True)
 

src/email_client.py

@@ -115,6 +115,7 @@ def fetch_unseen_emails(account: EmailAccount) -> list[Email]:
     emails = []
 
     for uid in uids:
+        try:
             _, msg_data = conn.uid("FETCH", uid, "RFC822")
             if msg_data[0] is None:
                 logger.warning("UID %s FETCH 返回空，跳过", uid)
@@ -133,6 +134,9 @@ def fetch_unseen_emails(account: EmailAccount) -> list[Email]:
             logger.info("  邮件: [%s] from=%s to=%s reply-to=%s (%d 字符)", subject, sender, recipient, reply_to, body_len)
             emails.append(Email(uid=uid, subject=subject, sender=sender, recipient=recipient,
                                 body=body, date=date_str, reply_to=reply_to, account_email=account.username))
+        except Exception as e:
+            logger.error("UID %s FETCH 失败，跳过: %s", uid, e)
+            continue
 
     conn.logout()
     logger.info("共获取 %d 封新邮件", len(emails))