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>

apps/api/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "@goodgo/api",
+  "version": "0.0.1",
+  "private": true,
+  "scripts": {
+    "dev": "nest start --watch",
+    "build": "nest build",
+    "start": "node dist/main",
+    "start:prod": "node dist/main",
+    "lint": "eslint \"{src,test}/**/*.ts\"",
+    "test": "vitest run",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@nestjs/common": "^11.0.0",
+    "@nestjs/core": "^11.0.0",
+    "@nestjs/cqrs": "^11.0.0",
+    "@nestjs/platform-express": "^11.0.0",
+    "reflect-metadata": "^0.2.0",
+    "rxjs": "^7.8.0"
+  },
+  "devDependencies": {
+    "@nestjs/cli": "^11.0.0",
+    "@nestjs/schematics": "^11.0.0",
+    "@nestjs/testing": "^11.0.0",
+    "@types/express": "^5.0.0",
+    "@types/node": "^22.0.0",
+    "typescript": "^5.7.0",
+    "vitest": "^3.0.0"
+  }
+}