feat: add prettier formatter and MIT license

- Add prettier dev dependency for code formatting
- Create MIT LICENSE file
- Format TypeScript files with prettier
- Update provider order in README (Qwen coder first)
- Update add provider screenshot with new UI

pnpm-lock.yaml

@@ -33,6 +33,9 @@ importers:
       '@vitejs/plugin-react':
         specifier: ^4.2.0
         version: 4.7.0(vite@5.4.19(@types/node@20.19.9))
+      prettier:
+        specifier: ^3.6.2
+        version: 3.6.2
       typescript:
         specifier: ^5.3.0
         version: 5.9.2
@@ -574,6 +577,11 @@ packages:
     resolution: {integrity: sha512-3Ybi1tAuwAP9s0r1UQ2J4n5Y0G05bJkpUIO0/bI9MhwmD70S5aTWbXGBwxHrelT+XM1k6dM0pk+SwNkpTRN7Pg==}
     engines: {node: ^10 || ^12 || >=14}
 
+  prettier@3.6.2:
+    resolution: {integrity: sha512-I7AIg5boAr5R0FFtJ6rCfD+LFsWHp81dolrFD8S79U9tb8Az2nGrJncnMSnys+bpQJfRUzqs9hnA81OAA3hCuQ==}
+    engines: {node: '>=14'}
+    hasBin: true
+
   react-dom@18.3.1:
     resolution: {integrity: sha512-5m4nQKp+rZRb09LNH59GM4BxTh9251/ylbKIbpe7TpGxfJ+9kv6BLkLBXIjjspbgbnIBNqlI23tRnTWT0snUIw==}
     peerDependencies:
@@ -1094,6 +1102,8 @@ snapshots:
       picocolors: 1.1.1
       source-map-js: 1.2.1
 
+  prettier@3.6.2: {}
+
   react-dom@18.3.1(react@18.3.1):
     dependencies:
       loose-envify: 1.4.0