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>

package.json

@@ -0,0 +1,24 @@
+{
+  "name": "goodgo-platform",
+  "private": true,
+  "packageManager": "pnpm@10.27.0",
+  "engines": {
+    "node": ">=22.0.0"
+  },
+  "pnpm": {
+    "onlyBuiltDependencies": [
+      "@nestjs/core",
+      "esbuild"
+    ]
+  },
+  "scripts": {
+    "dev": "turbo run dev",
+    "build": "turbo run build",
+    "lint": "turbo run lint",
+    "test": "turbo run test",
+    "typecheck": "turbo run typecheck"
+  },
+  "devDependencies": {
+    "turbo": "^2.9.4"
+  }
+}