feat: add ESLint flat config, Prettier, dependency-cruiser, and Husky

Setup code quality tooling for the monorepo:
- ESLint 9 flat config with TypeScript, import ordering, and NestJS rules
- Prettier with consistent formatting across all files
- dependency-cruiser enforcing module boundary rules (no cross-module internals, no circular deps)
- Husky + lint-staged for pre-commit hooks
- Auto-fixed existing files for type imports and import ordering

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/tailwind.config.ts

@@ -1,10 +1,7 @@
 import type { Config } from 'tailwindcss';
 
 const config: Config = {
-  content: [
-    './app/**/*.{ts,tsx}',
-    './components/**/*.{ts,tsx}',
-  ],
+  content: ['./app/**/*.{ts,tsx}', './components/**/*.{ts,tsx}'],
   theme: {
     extend: {},
   },