feat(kilo): fetch free models from Kilo API + Windows build fixes (#455)

- Add /api/providers/kilo/free-models endpoint with 1hr cache
- Fetch and merge Kilo free models with hardcoded models for kilocode provider
- Display 'Free' badge on models fetched from Kilo API
- Fix Windows build: add cross-env, remove --webpack flag, add turbopack config
- Add outputFileTracingExcludes for Windows system directories

next.config.mjs

@@ -2,10 +2,18 @@
 const nextConfig = {
   output: "standalone",
   serverExternalPackages: ["better-sqlite3"],
+  outputFileTracingExcludes: {
+    "*": [
+      "**/Cookies/**",
+      "**/AppData/Local/**",
+      "**/node_modules/.cache/**",
+    ],
+  },
   images: {
     unoptimized: true
   },
   env: {},
+  turbopack: {},
   webpack: (config, { isServer }) => {
     // Ignore fs/path modules in browser bundle
     if (!isServer) {