修复中控自更新触发与错误提示；实例页改为表格，带鱼屏宽度锁 1800。

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

static/settings_update.js

@@ -6,14 +6,39 @@
   }
 
   async function fetchJson(url, opts) {
-    const r = await fetch(url, Object || {});
-    let data = {};
+    const base = opts || {};
+    const headers = Object.assign({ Accept: "application/json" }, base.headers || {});
     try {
-      data = await r.json();
+      const r = await fetch(
+        url,
+        Object.assign({}, base, {
+          credentials: "same-origin",
+          headers: headers,
+        })
+      );
+      const text = await r.text();
+      let data = {};
+      try {
+        data = text ? JSON.parse(text) : {};
+      } catch (e) {
+        data = {
+          ok: false,
+          msg: "非 JSON 响应 HTTP " + r.status + (text ? ": " + String(text).slice(0, 120) : ""),
+        };
+      }
+      if (!data || typeof data !== "object") data = {};
+      if (data.ok == null && !r.ok) {
+        data.ok = false;
+        data.msg = data.msg || "请求失败 HTTP " + r.status;
+      }
+      return { httpOk: r.ok, status: r.status, data: data };
     } catch (e) {
-      data = {};
+      return {
+        httpOk: false,
+        status: 0,
+        data: { ok: false, msg: (e && e.message) || "网络错误" },
+      };
     }
-    return { httpOk: r.ok, status: r.status, data: data };
   }
 
   function escapeHtml(s) {
@@ -71,7 +96,7 @@
       }
       setStatus(statusEl, "更新中… (" + (i + 1) + "/" + maxTries + ")", "pending");
     }
-    setStatus(statusEl, "超时未确认上线,请稍后刷新版本或查服务器日志", "err");
+    setStatus(statusEl, "超时未确认上线,请稍后刷新版本或查看 logs/hub_update.log", "err");
     return null;
   }
 
@@ -115,7 +140,10 @@
     });
     const data = res.data || {};
     if (!data.ok) {
-      setStatus(statusEl, data.msg || "更新失败", "err");
+      const detail =
+        data.msg ||
+        (res.status ? "更新失败 HTTP " + res.status : "更新失败(无响应)");
+      setStatus(statusEl, detail, "err");
       btn.disabled = false;
       return;
     }
@@ -178,7 +206,11 @@
     });
     const data = res.data || {};
     if (!data.ok) {
-      setStatus(statusEl, data.msg || "更新失败", "err");
+      setStatus(
+        statusEl,
+        data.msg || (res.status ? "更新失败 HTTP " + res.status : "更新失败"),
+        "err"
+      );
       btn.disabled = false;
       return;
     }