feat: enhance remote model search to use dynamic catalog

Replace hardcoded list of popular models with dynamic catalog from getCatalogModels().
Enable searching by model name or description and include model descriptions in results. Improves discoverability and maintains up-to-date model list without manual updates. Database files updated accordingly.

lib/catalog.ts

@@ -0,0 +1,50 @@
+import fs from "node:fs/promises";
+import path from "node:path";
+
+type CatalogModel = {
+  name: string;
+  description?: string;
+  capabilities?: string[];
+  parameter_sizes?: string[];
+  pulls?: string;
+  tags_count?: number;
+  last_updated?: string;
+  url?: string;
+};
+
+type CatalogFile = {
+  models?: CatalogModel[];
+};
+
+let cachedModels: CatalogModel[] | null = null;
+let cachedMtimeMs: number | null = null;
+
+function resolveCatalogPath(): string {
+  // Arquivo fica em data/models.json na raiz do projeto
+  return path.join(process.cwd(), "data", "models.json");
+}
+
+export async function getCatalogModels(): Promise<CatalogModel[]> {
+  try {
+    const catalogPath = resolveCatalogPath();
+    const stat = await fs.stat(catalogPath);
+
+    // Cache simples por mtime
+    if (cachedModels && cachedMtimeMs && stat.mtimeMs === cachedMtimeMs) {
+      return cachedModels;
+    }
+
+    const raw = await fs.readFile(catalogPath, "utf-8");
+    const json = JSON.parse(raw) as CatalogFile;
+    const models = Array.isArray(json.models) ? json.models : [];
+
+    cachedModels = models;
+    cachedMtimeMs = stat.mtimeMs;
+    return models;
+  } catch (error) {
+    // Em caso de erro, retorne array vazio para não quebrar a UI
+    return [];
+  }
+}
+
+