fix: resolve stuck detecting state for panel stats on subpath deploy

Always inject panel_base from PANEL_PATH for static/API URLs and set
SCRIPT_NAME in middleware so /api/stats works behind nginx subpaths.

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

panel/static/app.js

@@ -5,9 +5,18 @@ function toast(msg) {
   setTimeout(() => el.classList.add("hidden"), 2200);
 }
 
+function panelBase() {
+  const fromBody = (document.body.dataset.base || "").replace(/\/$/, "");
+  if (fromBody) return fromBody;
+  const parts = location.pathname.split("/").filter(Boolean);
+  if (parts.length && parts[0].startsWith("jiedian-")) {
+    return `/${parts[0]}`;
+  }
+  return "";
+}
+
 function apiUrl(path) {
-  const base = (document.body.dataset.base || "").replace(/\/$/, "");
-  return `${base}${path}`;
+  return `${panelBase()}${path}`;
 }
 
 function copyText(text) {
@@ -169,18 +178,23 @@ function updateStats(data) {
 
 async function refreshStats() {
   try {
-    const res = await fetch(apiUrl("/api/stats"));
+    const res = await fetch(apiUrl("/api/stats"), { credentials: "same-origin" });
     if (!res.ok) {
       throw new Error(`HTTP ${res.status}`);
     }
     const data = await res.json();
     updateStats(data);
-  } catch {
+  } catch (err) {
     const statusEl = document.getElementById("summaryStatus");
     if (statusEl) {
       statusEl.textContent = "不可用";
       statusEl.className = "status-text err";
     }
+    document.querySelectorAll('[data-role="status"]').forEach((el) => {
+      el.textContent = "未知";
+      el.classList.add("offline");
+    });
+    console.error("stats refresh failed:", err);
   }
 }