chore(bot): update eslint (#300)

- Update `eslint` to `~9.35.0`
- Update `eslint-config-prettier` to `^10.1.8`
- Update `eslint-plugin-prettier` to `^5.5.4`
- Update `prettier` to `^3.6.2`
- Replace deprecated `@typescript-eslint/eslint-plugin` and `@typescript-eslint/parser` with `typescript-eslint` package
- Migrate ESLint configuration to `eslint.config.mjs` using the new flat config format

Author: risantos

.eslintignore

@@ -1,3 +1,3 @@
 module.exports = {
-  presets: [require.resolve('@docusaurus/core/lib/babel/preset')],
+  presets: [require.resolve('@docusaurus/core/lib/babel/preset')]
 };

.eslintrc

@@ -0,0 +1,50 @@
+import { defineConfig, globalIgnores } from 'eslint/config';
+import eslint from '@eslint/js';
+import prettierConfig from 'eslint-config-prettier';
+import prettierPlugin from 'eslint-plugin-prettier';
+import tseslint from 'typescript-eslint';
+
+export default defineConfig([
+  eslint.configs.recommended,
+  tseslint.configs.recommended,
+  {
+    ...prettierConfig,
+    name: 'prettier-config',
+    plugins: { prettier: prettierPlugin },
+    rules: {
+      'prettier/prettier': 'error'
+    }
+  },
+  {
+    files: ['**/*.js'],
+    languageOptions: {
+      parserOptions: {
+        sourceType: 'commonjs'
+      }
+    }
+  },
+  {
+    files: ['**/*.ts', '**/*.tsx'],
+    languageOptions: {
+      parser: tseslint.parser,
+      parserOptions: {
+        project: './tsconfig.json',
+        sourceType: 'module',
+        tsconfigRootDir: import.meta.dirname
+      }
+    },
+    name: 'wise-old-man/client-js',
+    rules: {
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        {
+          argsIgnorePattern: '^_',
+          caughtErrorsIgnorePattern: '^_'
+        }
+      ],
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+      '@typescript-eslint/no-non-null-assertion': 'off'
+    }
+  },
+  globalIgnores(['dist', 'docs', 'node_modules'])
+]);