chore(web): add ESLint rules for i18n JSON validation (#30491)

web/eslint.config.mjs

@@ -130,15 +130,6 @@ export default antfu(
       sonarjs: sonar,
     },
   },
-  // allow generated i18n files (like i18n/*/workflow.ts) to exceed max-lines
-  {
-    files: ['i18n/**'],
-    rules: {
-      'sonarjs/max-lines': 'off',
-      'max-lines': 'off',
-      'jsonc/sort-keys': 'error',
-    },
-  },
   tailwind.configs['flat/recommended'],
   {
     settings: {
@@ -191,4 +182,19 @@ export default antfu(
       'dify-i18n/require-ns-option': 'error',
     },
   },
+  // i18n JSON validation rules
+  {
+    files: ['i18n/**/*.json'],
+    plugins: {
+      'dify-i18n': difyI18n,
+    },
+    rules: {
+      'sonarjs/max-lines': 'off',
+      'max-lines': 'off',
+      'jsonc/sort-keys': 'error',
+
+      'dify-i18n/valid-i18n-keys': 'error',
+      'dify-i18n/no-extra-keys': 'error',
+    },
+  },
 )