fix: use original email subject for reply, not AI-extracted title Reply emails should use the original subject from IMAP header (e.g. 'Re: [original]'), not the AI-generated Chinese summary title.

src/tg_bot.py

@@ -360,7 +360,7 @@ def _handle_callback(bot_token: str, cfg: Config, cb: dict):
     action = parts[0]
 
     ctx = load_email_context(msg_id)
-    subject = ctx["subject"] if ctx else "?"
+    subject = ctx.get("original_subject") or ctx["subject"] if ctx else "?"
     logger.info("TG 回调: action=%s msg_id=%d subject=%s", action, msg_id, subject)
 
     if action == CALLBACK_VIEW_ORIG and ctx:
@@ -725,7 +725,7 @@ def _do_send_reply(bot_token: str, cfg: Config,
         to_addr = parseaddr(ctx["sender"])[1]
     if not to_addr:
         to_addr = ctx["sender"]
-    subject = ctx["subject"]
+    subject = ctx.get("original_subject") or ctx["subject"]
 
     # 下载 Telegram 附件到本地
     local_files = []