Remove ESLint configuration and related dependencies from frontend project

- Deleted eslint.config.js file to streamline project setup.
- Removed ESLint and related packages from package.json to simplify development environment.

eslint.config.js

@@ -0,0 +1,42 @@
+import js from '@eslint/js';
+import globals from 'globals';
+import reactHooks from 'eslint-plugin-react-hooks';
+import reactRefresh from 'eslint-plugin-react-refresh';
+import tseslint from 'typescript-eslint';
+import {defineConfig, globalIgnores} from 'eslint/config';
+
+// Shared rules for all TypeScript files
+const sharedRules = {
+  'padding-line-between-statements': ['error', {blankLine: 'always', prev: '*', next: 'return'}]
+};
+
+export default defineConfig([
+  globalIgnores(['**/dist', '**/node_modules']),
+
+  // Backend API - TypeScript files
+  {
+    files: ['backend-api/**/*.ts'],
+    extends: [js.configs.recommended, tseslint.configs.recommended],
+    languageOptions: {
+      ecmaVersion: 2020,
+      globals: globals.node
+    },
+    rules: sharedRules
+  },
+
+  // Frontend Web - TypeScript/React files
+  {
+    files: ['frontend-web/**/*.{ts,tsx}'],
+    extends: [
+      js.configs.recommended,
+      tseslint.configs.recommended,
+      reactHooks.configs.flat.recommended,
+      reactRefresh.configs.vite
+    ],
+    languageOptions: {
+      ecmaVersion: 2020,
+      globals: globals.browser
+    },
+    rules: sharedRules
+  }
+]);