Refactor error handling to config-driven approach with centralized error rules

Made-with: Cursor

src/shared/utils/providerModelsFetcher.js

@@ -1,28 +1,14 @@
 // Fetch and cache suggested models for providers that expose a public models API
-// Designed to be extensible: add new types in FILTERS below
+// Fetches via backend proxy to avoid CORS issues
 
 const CACHE_TTL_MS = 10 * 60 * 1000; // 10 minutes
 const cache = new Map(); // key: fetcher.url → { data, expiresAt }
 
-const FILTERS = {
-  // Free models with context >= 200k tokens
-  "openrouter-free": (models) =>
-    models
-      .filter(
-        (m) =>
-          m.pricing?.prompt === "0" &&
-          m.pricing?.completion === "0" &&
-          m.context_length >= 200000
-      )
-      .map((m) => ({ id: m.id, name: m.name, contextLength: m.context_length }))
-      .sort((a, b) => b.contextLength - a.contextLength),
-};
-
 /**
  * Fetch suggested models for a provider using its modelsFetcher config.
  * Results are cached in-memory for CACHE_TTL_MS.
  * @param {{ url: string, type: string }} fetcher
- * @returns {Promise<Array<{ id: string, name: string, contextLength: number }>>}
+ * @returns {Promise<Array<{ id: string, name: string, contextLength?: number }>>}
  */
 export async function fetchSuggestedModels(fetcher) {
   if (!fetcher?.url || !fetcher?.type) return [];
@@ -31,12 +17,11 @@ export async function fetchSuggestedModels(fetcher) {
   if (cached && Date.now() < cached.expiresAt) return cached.data;
 
   try {
-    const res = await fetch(fetcher.url);
+    const params = new URLSearchParams({ url: fetcher.url, type: fetcher.type });
+    const res = await fetch(`/api/providers/suggested-models?${params}`);
     if (!res.ok) return [];
     const json = await res.json();
-    const raw = json.data ?? json.models ?? json;
-    const filter = FILTERS[fetcher.type];
-    const data = filter ? filter(Array.isArray(raw) ? raw : []) : [];
+    const data = json.data ?? [];
     cache.set(fetcher.url, { data, expiresAt: Date.now() + CACHE_TTL_MS });
     return data;
   } catch {