fix(auto_put_ad_mini): 飞书审批轮询增加 HTTP 兜底，修复 WebSocket 断连时无法检测回复

local_chat_history 模式依赖 WebSocket 推送写入本地文件，当 WebSocket 断连时
审批回复永远无法被检测到。改为双通道：本地每 1 秒检测 + HTTP API 每 30 秒兜底。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

examples/auto_put_ad_mini/tools/im_approval.py

@@ -719,12 +719,12 @@ async def send_approval_request(
                 },
             )
 
-        # ═══ 等待飞书回复（优先读本地 chat_history，回退到 HTTP 轮询）═══
+        # ═══ 等待飞书回复（本地 chat_history + HTTP 轮询双通道）═══
         timeout_at = datetime.now() + timedelta(minutes=timeout_minutes)
         use_local_poll = bool(_operator_contact_name)
         logger.info(
             "等待审批回复：mode=%s，超时 %d 分钟",
-            "local_chat_history" if use_local_poll else "http_poll",
+            "local+http" if use_local_poll else "http_poll",
             timeout_minutes,
         )
 
@@ -781,9 +781,11 @@ async def send_approval_request(
                         )
                 except Exception as e:
                     logger.debug("读取 chat_history 失败（将重试）: %s", e)
-                continue  # 跳过 HTTP 轮询
+                # 每 30 秒同时尝试 HTTP 轮询（兜底：WebSocket 断连时仍可检测）
+                if poll_count % 30 != 0:
+                    continue
 
-            # ─── 回退：HTTP 轮询（原有逻辑，仅在联系人未配置时使用）───
+            # ─── HTTP 轮询（主通道 / 每 30 秒兜底）───
             try:
                 for chat_id in poll_chat_ids:
                     result = _feishu.get_message_list(