feat: 收件人/发件人改用邮件原始头数据

- sender 从 decode 改为使用原始 From 头
- 新增 recipient 字段，使用原始 To 头
- 移除 ai_process 中对 acct.username 的依赖

src/summarizer.py

@@ -22,16 +22,16 @@ def poll_accounts(cfg: Config) -> Generator[tuple[int, Email], None, None]:
 
 
 def ai_process(cfg: Config, acct_idx: int, mail: Email) -> Optional[dict]:
-    acct = cfg.email_accounts[acct_idx]
     logger.info(f"  正在摘要: {mail.subject}")
-    summary = summarize_email(cfg.ai, acct.username, mail.subject, mail.sender, mail.body)
-    summary["recipient"] = acct.username
+    summary = summarize_email(cfg.ai, mail.recipient, mail.subject, mail.sender, mail.body)
+    summary["recipient"] = mail.recipient
     text = format_summary(summary)
     return {
         "text": text,
         "data": summary,
         "original_body": mail.body,
         "original_sender": mail.sender,
+        "original_recipient": mail.recipient,
         "acct_idx": acct_idx,
         "uid": mail.uid,
     }
@@ -42,6 +42,7 @@ def tg_send_and_mark(cfg: Config, info: dict):
     send_summary(cfg.telegram, cfg.telegram.chat_id,
                  info["text"], info["data"],
                  info["original_body"], info["acct_idx"],
-                 original_sender=info.get("original_sender", ""))
+                 original_sender=info.get("original_sender", ""),
+                 original_recipient=info.get("original_recipient", ""))
     mark_as_seen(acct, [info["uid"]])
     logger.info(f"  已发送并标记已读")