🔧 chore(voxel-lava): add ESLint v9 flat config for backend

- Add eslint.config.mjs with ESLint v9 flat config
- Add missing dependencies (@eslint/js, globals, typescript-eslint)
- Auto-fix formatting issues from ESLint --fix

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

games/voxel-lava/apps/backend/eslint.config.mjs

@@ -0,0 +1,40 @@
+// @ts-check
+import eslint from '@eslint/js';
+import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+	{
+		ignores: ['eslint.config.mjs', 'dist/**'],
+	},
+	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': 'warn',
+			'@typescript-eslint/no-unsafe-argument': 'warn',
+			'@typescript-eslint/no-unsafe-assignment': 'off',
+			'@typescript-eslint/no-unsafe-member-access': 'off',
+			'@typescript-eslint/no-unsafe-call': 'off',
+			'@typescript-eslint/no-unsafe-return': 'off',
+			'@typescript-eslint/no-require-imports': 'off',
+			'@typescript-eslint/no-redundant-type-constituents': 'off',
+		},
+	},
+);

games/voxel-lava/apps/backend/package.json

@@ -31,6 +31,7 @@
 		"rxjs": "^7.8.1"
 	},
 	"devDependencies": {
+		"@eslint/js": "^9.17.0",
 		"@nestjs/cli": "^10.4.9",
 		"@nestjs/schematics": "^10.2.3",
 		"@types/express": "^5.0.0",
@@ -40,6 +41,8 @@
 		"eslint": "^9.17.0",
 		"eslint-config-prettier": "^9.1.0",
 		"eslint-plugin-prettier": "^5.2.1",
+		"globals": "^16.0.0",
+		"typescript-eslint": "^8.18.1",
 		"prettier": "^3.4.2",
 		"source-map-support": "^0.5.21",
 		"ts-loader": "^9.5.1",

games/voxel-lava/apps/backend/src/db/connection.ts

@@ -2,7 +2,7 @@ import { drizzle } from 'drizzle-orm/postgres-js';
 import * as schema from './schema';
 
 // Use require for postgres to avoid ESM/CommonJS interop issues
-// eslint-disable-next-line @typescript-eslint/no-var-requires
+
 const postgres = require('postgres');
 
 let connection: ReturnType<typeof postgres> | null = null;