fix: remove null parse_mode from tg payload, add error logging

src/tg_bot.py

@@ -26,12 +26,14 @@ def send_summary(tg_cfg: TelegramConfig, chat_id: str, summary_text: str,
     is_verification = summary_data.get("category") == "notification" and summary_data.get("verification_code")
     plain_text = is_promotion or is_verification
     links = summary_data.get("links", [])
-    result = _tg_req(tg_cfg, "sendMessage", {
+    msg_payload = {
         "chat_id": chat_id,
         "text": summary_text,
-        "parse_mode": "MarkdownV2" if not plain_text else None,
         "reply_markup": _summary_keyboard(can_reply, is_promotion, links),
-    })
+    }
+    if not plain_text:
+        msg_payload["parse_mode"] = "MarkdownV2"
+    result = _tg_req(tg_cfg, "sendMessage", msg_payload)
     msg_id = result["result"]["message_id"]
     _email_contexts[msg_id] = {
         "summary_text": summary_text,
@@ -207,7 +209,10 @@ def _ai_reply_keyboard(msg_id: int, suggestions: list) -> dict:
 
 def _tg_req(tg_cfg: TelegramConfig, method: str, payload: dict) -> dict:
     url = f"https://api.telegram.org/bot{tg_cfg.bot_token}/{method}"
+    logger.info("Telegram API %s: %s", method, {k: (v if k != "reply_markup" else "...") for k, v in payload.items()})
     r = requests.post(url, json=payload, timeout=30)
+    if not r.ok:
+        logger.error("Telegram API %s 失败: %s %s", method, r.status_code, r.text[:500])
     r.raise_for_status()
     result = r.json()
     if not result.get("ok"):