chore: initialize monorepo tooling

turbo.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "https://turbo.build/schema.json",
+  "tasks": {
+    "build": { "dependsOn": ["^build"], "outputs": ["dist/**", ".next/**"] },
+    "dev": { "cache": false, "persistent": true },
+    "lint": { "dependsOn": ["^lint"], "outputs": [] },
+    "typecheck": { "dependsOn": ["^typecheck"], "outputs": [] },
+    "clean": { "cache": false }
+  }
+}