Integrate Oudelaa backend features, security, tests, and deployment updates

eslint.config.mjs

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+import eslint from '@eslint/js';
+import eslintConfigPrettier from 'eslint-config-prettier';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  { ignores: ['dist/**', 'node_modules/**', 'coverage/**'] },
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
+    files: ['**/*.ts'],
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.jest,
+      },
+    },
+    rules: {
+      'no-undef': 'off',
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-require-imports': 'off',
+      '@typescript-eslint/no-unused-vars': [
+        'warn',
+        { argsIgnorePattern: '^_', varsIgnorePattern: '^_' },
+      ],
+    },
+  },
+  eslintConfigPrettier,
+);