chore: migrate to @vigdorov/* shared configs (eslint, prettier, typescript, vite)

Replace project-local ESLint, Prettier, TypeScript, and Vite configs
with shared packages from dev-configs monorepo.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/.prettierrc

@@ -1,4 +0,0 @@
-{
-  "singleQuote": true,
-  "trailingComma": "all"
-}

backend/eslint.config.mjs

@@ -1,39 +1,3 @@
-// @ts-check
-import eslint from '@eslint/js';
-import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
-import globals from 'globals';
-import tseslint from 'typescript-eslint';
+import {node} from '@vigdorov/eslint-config';
 
-export default tseslint.config(
-  {
-    ignores: ['eslint.config.mjs', 'coverage'],
-  },
-  eslint.configs.recommended,
-  ...tseslint.configs.recommendedTypeChecked,
-  eslintPluginPrettierRecommended,
-  {
-    languageOptions: {
-      globals: {
-        ...globals.node,
-        ...globals.jest,
-      },
-      sourceType: 'commonjs',
-      parserOptions: {
-        projectService: true,
-        tsconfigRootDir: import.meta.dirname,
-      },
-    },
-  },
-  {
-    rules: {
-      '@typescript-eslint/no-explicit-any': 'off',
-      '@typescript-eslint/no-floating-promises': 'error',
-      '@typescript-eslint/no-unsafe-argument': 'error',
-      '@typescript-eslint/no-unsafe-assignment': 'error',
-      '@typescript-eslint/no-unsafe-call': 'error',
-      '@typescript-eslint/no-unsafe-member-access': 'error',
-      '@typescript-eslint/no-unsafe-return': 'error',
-      "prettier/prettier": ["error", { endOfLine: "auto" }],
-    },
-  },
-);
+export default node();

backend/package.json

@@ -46,8 +46,6 @@
     "typeorm": "^0.3.28"
   },
   "devDependencies": {
-    "@eslint/eslintrc": "^3.2.0",
-    "@eslint/js": "^9.18.0",
     "@nestjs/cli": "^11.0.0",
     "@nestjs/schematics": "^11.0.0",
     "@nestjs/testing": "^11.0.1",
@@ -56,12 +54,10 @@
     "@types/node": "^22.10.7",
     "@types/passport-jwt": "^4.0.1",
     "@types/supertest": "^6.0.2",
+    "@vigdorov/eslint-config": "^1.0.1",
+    "@vigdorov/typescript-config": "^1.1.0",
     "eslint": "^9.18.0",
-    "eslint-config-prettier": "^10.0.1",
-    "eslint-plugin-prettier": "^5.2.2",
-    "globals": "^16.0.0",
     "jest": "^30.0.0",
-    "prettier": "^3.4.2",
     "source-map-support": "^0.5.21",
     "supertest": "^7.0.0",
     "ts-jest": "^29.2.5",

backend/tsconfig.json

@@ -1,25 +1,16 @@
 {
+  "extends": "@vigdorov/typescript-config/node",
   "compilerOptions": {
     "module": "nodenext",
     "moduleResolution": "nodenext",
     "resolvePackageJsonExports": true,
-    "esModuleInterop": true,
-    "isolatedModules": true,
-    "declaration": true,
-    "removeComments": true,
-    "emitDecoratorMetadata": true,
-    "experimentalDecorators": true,
-    "allowSyntheticDefaultImports": true,
     "target": "ES2023",
-    "sourceMap": true,
     "outDir": "./dist",
     "baseUrl": "./",
-    "incremental": true,
-    "skipLibCheck": true,
     "strictNullChecks": true,
-    "forceConsistentCasingInFileNames": true,
     "noImplicitAny": false,
     "strictBindCallApply": false,
+    "strictPropertyInitialization": false,
     "noFallthroughCasesInSwitch": false
   }
 }