fix deployment and frontend build regressions

frontend/src/lib/models.ts

@@ -110,31 +110,35 @@ export function normalizeModel(raw: any): Model | null {
   }
 }
 
-export async function loadFallbackModels() {
-  // latest_models.json is a local runtime snapshot when present.
-  // models.json is the committed fixture fallback kept in the repo.
-  const sources = [
-    () => import('../data/latest_models.json'),
-    () => import('../data/models.json'),
-  ]
+function normalizeModelList(raw: any) {
+  const arr: any[] = Array.isArray(raw) ? raw : (raw?.models || [])
+  return arr
+    .map(normalizeModel)
+    .filter((model: Model | null): model is Model => model !== null)
+}
 
-  for (const load of sources) {
-    try {
-      const module = await load()
-      const raw = module.default as any
-      const arr: any[] = Array.isArray(raw) ? raw : (raw.models || [])
-      const normalized = arr
-        .map(normalizeModel)
-        .filter((model: Model | null): model is Model => model !== null)
-      if (normalized.length > 0) {
-        return normalized
-      }
-    } catch {
-      // 继续尝试下一个回退源
+async function loadRuntimeSnapshot() {
+  try {
+    const response = await fetch('/latest_models.json', { cache: 'no-store' })
+    if (!response.ok) {
+      return []
     }
+
+    const raw = await response.json()
+    return normalizeModelList(raw)
+  } catch {
+    return []
+  }
+}
+
+export async function loadFallbackModels() {
+  const snapshot = await loadRuntimeSnapshot()
+  if (snapshot.length > 0) {
+    return snapshot
   }
 
-  return []
+  const module = await import('../data/models.json')
+  return normalizeModelList(module.default)
 }
 
 export function formatPrice(model: Model, kind: 'input' | 'output') {