Fix: Configure ESLint for type-aware linting

eslint.config.js

@@ -6,12 +6,17 @@ import tseslint from "typescript-eslint";
 
 export default tseslint.config(
   { ignores: ["dist"] },
+  // Frontend configuration with type-aware rules
   {
-    extends: [js.configs.recommended, ...tseslint.configs.recommended],
-    files: ["**/*.{ts,tsx}"],
+    extends: [js.configs.recommended, ...tseslint.configs.recommendedTypeChecked],
+    files: ["src/**/*.{ts,tsx}"],
     languageOptions: {
       ecmaVersion: 2020,
       globals: globals.browser,
+      parserOptions: {
+        projectService: true,
+        tsconfigRootDir: import.meta.dirname,
+      },
     },
     plugins: {
       "react-hooks": reactHooks,
@@ -35,4 +40,23 @@ export default tseslint.config(
       }],
     },
   },
+  // API configuration without type-aware rules for better performance
+  {
+    extends: [js.configs.recommended, ...tseslint.configs.recommended],
+    files: ["api/**/*.ts"],
+    languageOptions: {
+      ecmaVersion: 2022,
+      globals: globals.node,
+    },
+    rules: {
+      "@typescript-eslint/no-unused-vars": "error",
+      "@typescript-eslint/no-explicit-any": "error",
+      "@typescript-eslint/explicit-function-return-type": ["error", {
+        allowExpressions: true,
+        allowTypedFunctionExpressions: true,
+        allowHigherOrderFunctions: true,
+        allowDirectConstAssertionInArrowFunctions: true,
+      }],
+    },
+  },
 );