fix(im_llm): 代理绕过Docker内部hostname

backend/python/app/api/admin/mcp_admin.py

@@ -855,17 +855,34 @@ def _test_mcp_server(server, db) -> dict:
                     hdrs = json.loads(server.headers) if isinstance(server.headers, str) else (server.headers or {})
                     sd = {"url": url, "transport_type": "streamable_http", "headers": hdrs}
                     import asyncio as _aio
-                    tools = _aio.run(_lmt(sd, timeout=15))
+                    # raise_on_error=True 让网络异常透传，暴露真实错误而非 "no tools found"
+                    tools = _aio.run(_lmt(sd, timeout=15, raise_on_error=True))
                     result["success"] = bool(tools)
                     result["details"]["tools_count"] = len(tools)
                     result["details"]["tools"] = [t.get("name") for t in tools[:5]]
-                    result["message"] = f"Connected — {len(tools)} tools available" if tools else "Connected but no tools found"
+                    if tools:
+                        result["message"] = f"Connected — {len(tools)} tools available"
+                    else:
+                        result["message"] = "Connected but no tools found (server returned empty list)"
                     result["details"]["status_code"] = 200
                     if tools:
                         server.tools_count = len(tools)
                         server.status = "connected"
                 except Exception as e:
-                    result["message"] = f"Connection failed: {str(e)}"
+                    # 把真实异常（类型+消息）透传给前端，告别误导性的 "Connected but no tools found"
+                    err_type = type(e).__name__
+                    err_msg = str(e)[:300]
+                    result["message"] = f"{err_type}: {err_msg}"
+                    result["details"]["error_type"] = err_type
+                    result["details"]["error"] = err_msg
+                    if "ConnectError" in err_type or "Timeout" in err_type:
+                        result["details"]["hint"] = "网络层无法到达 MCP 服务器，请检查代理配置或服务端 URL"
+                    elif "404" in err_msg or "NotFound" in err_type:
+                        result["details"]["hint"] = "服务端 URL 不存在或路径错误"
+                    elif "401" in err_msg or "Unauthorized" in err_type:
+                        result["details"]["hint"] = "认证失败：检查请求头中的 Authorization"
+                    else:
+                        result["details"]["hint"] = "检查认证头/transport_type 或服务端状态"
 
         elif transport == "sse":