Implement backend API and database services in Docker setup

- Added a new `api` service for the NestJS backend, including health checks and dependencies on PostgreSQL, Redis, and MinIO.
- Introduced PostgreSQL and Redis services with health checks and configurations for data persistence.
- Added MinIO for S3-compatible object storage and a one-shot service to initialize required buckets.
- Updated the Nginx configuration to proxy requests to the new backend API and MinIO storage.
- Enhanced the Dockerfile to support the new API environment variables and configurations.
- Updated the `package.json` and `package-lock.json` to include new dependencies for QR code generation and other utilities.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/eslint.config.mjs

@@ -0,0 +1,92 @@
+import typescriptEslint from '@typescript-eslint/eslint-plugin';
+import unicorn from 'eslint-plugin-unicorn';
+import importPlugin from 'eslint-plugin-import';
+import tsParser from '@typescript-eslint/parser';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import js from '@eslint/js';
+import { FlatCompat } from '@eslint/eslintrc';
+import eslintPluginPrettier from 'eslint-plugin-prettier';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all,
+});
+
+export default [
+  {
+    ignores: [
+      '**/node_modules',
+      '**/dist',
+      'commitlint.config.js',
+      'eslint.config.mjs',
+    ],
+  },
+  ...compat.extends(
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:unicorn/recommended',
+    'plugin:import/recommended',
+    'plugin:import/typescript',
+    'plugin:prettier/recommended',
+  ),
+  {
+    plugins: {
+      '@typescript-eslint': typescriptEslint,
+      unicorn,
+      importPlugin,
+      eslintPluginPrettier,
+    },
+    settings: {
+      "import/resolver": {
+        // You will also need to install and configure the TypeScript resolver
+        // See also https://github.com/import-js/eslint-import-resolver-typescript#configuration
+        "typescript": true,
+        "node": true,
+      },
+    },
+
+    languageOptions: {
+      parser: tsParser,
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+
+      parserOptions: {
+        project: './tsconfig.json',
+      },
+    },
+
+    rules: {
+      'semi': 'off',
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-unused-vars': [
+        'warn',
+        {
+          argsIgnorePattern: '^_',
+        },
+      ],
+
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+      'unicorn/filename-case': [
+        'error',
+        {
+          case: 'kebabCase',
+        },
+      ],
+
+      'unicorn/prevent-abbreviations': [
+        'error',
+        {
+          replacements: {
+            props: false,
+          },
+        },
+      ],
+
+      indent: 'off',
+    },
+  },
+];