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

package.json

@@ -5,8 +5,8 @@
   "private": true,
   "scripts": {
     "dev": "next dev --webpack --port 20128",
-    "build": "NODE_ENV=production next build --webpack",
-    "start": "NODE_ENV=production next start",
+    "build": "cross-env NODE_ENV=production next build",
+    "start": "cross-env NODE_ENV=production next start",
     "dev:bun": "bun --bun next dev --webpack --port 20128",
     "build:bun": "NODE_ENV=production bun --bun next build --webpack",
     "start:bun": "NODE_ENV=production bun ./.next/standalone/server.js"
@@ -44,6 +44,7 @@
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4.1.18",
+    "cross-env": "^10.1.0",
     "eslint": "^9",
     "eslint-config-next": "16.1.6",
     "postcss": "^8.5.6",