Revert "chore: update dependencies and refactor perplexity module"

This reverts commit b281ab3.

Author: adamrefaey

backend/.eslintignore

@@ -0,0 +1,9 @@
+node_modules/
+cdk.out/
+coverage/
+config/
+.vscode/
+.gitignore
+.prettierrc
+.prettierignore
+.eslintignore

backend/.eslintrc.js

@@ -0,0 +1,22 @@
+module.exports = {
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    projectService: true, // Changed from project: 'tsconfig.json'
+    sourceType: 'module',
+  },
+  plugins: ['@typescript-eslint/eslint-plugin', 'prettier'],
+  extends: ['plugin:@typescript-eslint/recommended', 'plugin:prettier/recommended'],
+  root: true,
+  env: {
+    node: true,
+    jest: true,
+  },
+  ignorePatterns: ['.eslintrc.js'],
+  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',
+  },
+};