chore(monorepo 建置工具): 由 npm workspaces 遷移至 pnpm workspace + Turborepo

package.json

@@ -3,12 +3,9 @@
   "version": "0.1.0",
   "private": true,
   "description": "心音（Kokorone）— 戀愛陪伴系統 monorepo",
-  "workspaces": [
-    "apps/*",
-    "packages/*"
-  ],
+  "packageManager": "pnpm@11.21.0",
   "scripts": {
-    "build": "npm run build --workspaces --if-present",
+    "build": "turbo run build",
     "restart": "node scripts/dev-restart.mjs",
     "smoke": "node scripts/smoke/run.mjs"
   },
@@ -19,6 +16,7 @@
     "@types/node": "^26.2.0",
     "dotenv": "^17.4.2",
     "prisma": "^7.9.1",
+    "turbo": "^2.5.8",
     "typescript": "^7.0.2"
   }
 }