Add SSE second-level status push for control monitor.

Co-authored-by: Cursor <cursoragent@cursor.com>

control/backend/app/proxy.py

@@ -32,6 +32,7 @@ async def call_node(
     *,
     require_token: bool = True,
     json_body: dict | None = None,
+    timeout: float | None = None,
 ) -> tuple[int, Any]:
     settings = get_control_settings()
     base = str(node["base_url"]).rstrip("/")
@@ -43,9 +44,9 @@ async def call_node(
         headers["X-Fleet-Token"] = tok
         headers["Authorization"] = f"Fleet {tok}"
     url = f"{base}{path}"
-    timeout = settings.control_http_timeout_sec
+    to = float(timeout if timeout is not None else settings.control_http_timeout_sec)
     try:
-        async with httpx.AsyncClient(timeout=timeout, follow_redirects=False) as client:
+        async with httpx.AsyncClient(timeout=to, follow_redirects=False) as client:
             res = await client.request(method, url, headers=headers, json=json_body)
             # 少数反代会 301/302 补尾斜杠；手动跟一次并保留 Token 头
             if res.status_code in (301, 302, 307, 308) and res.headers.get("location"):
@@ -64,12 +65,20 @@ async def call_node(
         return 502, {"detail": f"连接失败: {e}"}
 
 
-async def probe_health(node: dict[str, Any]) -> dict[str, Any]:
-    code, data = await call_node(node, "GET", "/health", require_token=False)
+async def probe_health(
+    node: dict[str, Any],
+    *,
+    timeout: float | None = None,
+) -> dict[str, Any]:
+    code, data = await call_node(
+        node, "GET", "/health", require_token=False, timeout=timeout
+    )
     if code == 200 and isinstance(data, dict):
         return {"online": True, "health": data, "error": None}
     # fallback fleet status if health blocked
-    code2, data2 = await call_node(node, "GET", "/api/fleet/status", require_token=True)
+    code2, data2 = await call_node(
+        node, "GET", "/api/fleet/status", require_token=True, timeout=timeout
+    )
     if code2 == 200 and isinstance(data2, dict):
         return {"online": True, "health": data2, "error": None}
     detail = ""