feat: add ESLint configuration for frontend files and ignore patterns

eslint.config.js

@@ -0,0 +1,30 @@
+import frontendConfig from './frontend/eslint.config.js';
+
+export default [
+  {
+    ignores: [
+      'backend/**/*',
+      'data/**/*',
+      'scripts/**/*',
+      'tools/**/*',
+      'docs/**/*',
+      '.venv/**/*',
+      'node_modules/**/*',
+      'dist/**/*',
+      '*.md',
+      '*.yml',
+      '*.yaml',
+      '*.json',
+      '*.toml',
+      '*.sh',
+      'Dockerfile*',
+      '.git/**/*',
+      '.github/**/*'
+    ]
+  },
+  // Apply frontend config to frontend files only
+  ...frontendConfig.map(config => ({
+    ...config,
+    files: config.files ? config.files.map(pattern => `frontend/${pattern}`) : ['frontend/**/*.{ts,tsx,js,jsx}']
+  }))
+];

package.json

@@ -1,4 +1,5 @@
 {
+  "type": "module",
   "dependencies": {
     "tldts": "^7.0.19"
   }