chore: update dependencies and refactor perplexity module

- Updated AWS SDK and NestJS dependencies to their latest versions.
- Removed PerplexityController and related DTOs as they are no longer needed.
- Adjusted AppModule to remove references to the deleted PerplexityController.
- Updated route handling in AppModule for better clarity.

Author: adamrefaey

backend/.eslintignore

@@ -0,0 +1,44 @@
+const tseslint = require('typescript-eslint');
+const prettierConfig = require('eslint-plugin-prettier/recommended');
+const js = require('@eslint/js');
+const globals = require('globals');
+
+module.exports = tseslint.config(
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  prettierConfig,
+  {
+    ignores: [
+      '.eslintrc.js',
+      'node_modules/',
+      'cdk.out/',
+      'coverage/',
+      'config/',
+      '.vscode/',
+      '.gitignore',
+      '.prettierrc',
+      '.prettierignore',
+      '.eslintignore',
+    ],
+    languageOptions: {
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+      parser: tseslint.parser,
+      parserOptions: {
+        project: 'tsconfig.json',
+        sourceType: 'module',
+      },
+      globals: {
+        ...globals.node,
+        ...globals.jest,
+      },
+    },
+    rules: {
+      'prettier/prettier': 'error',
+      '@typescript-eslint/interface-name-prefix': 'off',
+      '@typescript-eslint/explicit-function-return-type': 'off',
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+      '@typescript-eslint/no-explicit-any': 'off',
+    },
+  },
+);