fix(im_bot): segment long WeChat text replies + enhance send diagnostics (#878)\n\niLink returns HTTP 200 but WeChat silently drops long messages (1698-char\nHTML image link, 3011-char skill list). Add WECHAT_TEXT_MAX_LEN=1500 and\nsegment long text into multiple items. Also log payload item lengths and\nmedia URL lengths for future diagnosis.

backend/python/app/api/im_bot_user.py

@@ -47,6 +47,10 @@ def _beijing_now() -> datetime:
 # ============================================================
 ILINK_BASE = "https://ilinkai.weixin.qq.com"
 
+# 微信/iLink 单条文本消息长度软上限。超过则分段发送，避免 iLink 返回 200
+# 但用户侧静默收不到（实测 1698 字符 HTML 链接、3011 字符 Markdown 均丢失）。
+WECHAT_TEXT_MAX_LEN = 1500
+
 # 每个已连接账号一个后台接收线程，key = 账号表主键 id
 _wechat_receiver_threads: dict[int, threading.Thread] = {}
 
@@ -212,10 +216,19 @@ def _wechat_post_msg(baseurl: str, bot_token: str, to_user_id: str, context_toke
     # 07-30 diagnostic
     import json as _json3
     try:
+        # 增强诊断：记录每条消息类型、长度、内容摘要，用于定位“iLink 200 但用户收不到”
+        _item_summaries = []
+        for _it in item_list:
+            _t = _it.get("type")
+            _txt = ""
+            if _t == 1 and _it.get("text_item"):
+                _txt = _it["text_item"].get("text", "")
+            _item_summaries.append(f"type={_t} len={len(_txt)} text={repr(_txt[:80])}")
         with open("/tmp/wechat_send_debug.log", "a", encoding="utf-8") as _f:
             _f.write(_beijing_now().isoformat() + " SEND_DEBUG token=" + repr(bot_token[:20] if bot_token else "NULL")
                      + " to=" + repr(to_user_id[:30]) + " ctx=" + repr(context_token[:30]) + "\n")
-            _f.write("  payload_keys=" + str(list(payload.get("msg", {}).keys())) + "\n")
+            _f.write("  payload_keys=" + str(list(payload.get("msg", {}).keys()))
+                     + " items=[" + "; ".join(_item_summaries) + "]\n")
     except Exception:
         pass
 
@@ -249,9 +262,49 @@ def _wechat_post_msg(baseurl: str, bot_token: str, to_user_id: str, context_toke
 
 
 def _wechat_send_message(baseurl: str, bot_token: str, to_user_id: str, context_token: str, text: str):
-    """发送纯文本回复。"""
+    """发送纯文本回复。长文本按 WECHAT_TEXT_MAX_LEN 分段，避免 iLink 200 但微信不显示。"""
+    if not text:
         return _wechat_post_msg(baseurl, bot_token, to_user_id, context_token,
-                             [{"type": 1, "text_item": {"text": text}}])
+                                 [{"type": 1, "text_item": {"text": "（无内容）"}}])
+    # 单条不超过软上限；保留完整段落优先在换行处切分
+    chunks = []
+    start = 0
+    while start < len(text):
+        end = min(start + WECHAT_TEXT_MAX_LEN, len(text))
+        if end < len(text):
+            # 尽量在换行处切断
+            _nl = text.rfind("\n", start, end)
+            if _nl > start + WECHAT_TEXT_MAX_LEN // 2:
+                end = _nl + 1
+        chunks.append(text[start:end])
+        start = end
+
+    all_ok = True
+    last_ret = None
+    for idx, chunk in enumerate(chunks):
+        suffix = ""
+        if len(chunks) > 1:
+            if idx == 0:
+                suffix = "\n（内容较长，分条发送）"
+            if idx == len(chunks) - 1:
+                suffix = "\n（已发送完毕；完整内容请访问平台 AI 聊天的 WeXin Bot 窗口）"
+        ok, ret, _ = _wechat_post_msg(
+            baseurl, bot_token, to_user_id, context_token,
+            [{"type": 1, "text_item": {"text": chunk + suffix}}]
+        )
+        if not ok:
+            all_ok = False
+            last_ret = ret
+            # 记录失败但不中断，尽量把已切好的消息发完
+            try:
+                with open("/tmp/wechat_send.log", "a", encoding="utf-8") as _f:
+                    _f.write(_beijing_now().isoformat() + " SEGMENT_FAIL idx=%s ret=%s\n" % (idx, ret))
+            except Exception:
+                pass
+        # 分段之间稍作间隔，降低频率/风控影响
+        if idx < len(chunks) - 1:
+            time.sleep(0.5)
+    return all_ok, last_ret, {}
 
 
 def _platform_relay_url(raw_url: str) -> str:
@@ -276,6 +329,11 @@ def _wechat_send_media(baseurl: str, bot_token: str, to_user_id: str, context_to
     确保用户可点击访问且不会破坏会话；待拿到 iLink 媒体协议文档后再恢复内联 item。
     """
     relay_url = _platform_relay_url(url)
+    try:
+        with open("/tmp/wechat_send_debug.log", "a", encoding="utf-8") as _f:
+            _f.write(_beijing_now().isoformat() + " MEDIA_URL_LEN=%s type=%s\n" % (len(relay_url), media_type))
+    except Exception:
+        pass
     if media_type == "image":
         caption = "🖼️ 图片已生成，点击查看：" + relay_url
     else:

backend/python/main.py

@@ -191,6 +191,13 @@ async def lifespan(app: FastAPI):
     except Exception as e:
         logger.warning(f"[EventBus] 启动失败(不影响正常服务): {e}")
 
+    # 启动个人微信接收线程（之前仅在扫码确认时启动，重启后丢失）
+    try:
+        from app.api.im_bot_user import start_all_wechat_receivers
+        start_all_wechat_receivers()
+    except Exception as e:
+        logger.warning(f"[IM个人微信] 启动恢复失败(不影响正常服务): {e}")
+
     logger.info("Qihu-AIFlow v2.0.0 启动完成")
 
     yield