feat: scaffold monorepo with Turborepo + NestJS + Next.js

- Turborepo monorepo with pnpm workspaces
- apps/api: NestJS 11.x with CQRS module
- apps/web: Next.js 14 App Router + TailwindCSS
- src/modules/shared: base entities, Result pattern, value objects
- TypeScript 5.7+ strict mode, shared tsconfig base
- Build pipeline: dev, build, lint, test, typecheck

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

.gitignore

@@ -0,0 +1,33 @@
+# dependencies
+node_modules/
+.pnpm-store/
+
+# build
+dist/
+.next/
+.turbo/
+out/
+
+# env
+.env
+.env.local
+.env.*.local
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# testing
+coverage/
+
+# misc
+*.log
+npm-debug.log*
+pnpm-debug.log*