test(unit): add lightweight vitest coverage for auth duration and seq pagination utils

Fabric.Backend.Guild/package.json

@@ -9,7 +9,8 @@
     "start:dev": "ts-node src/main.ts",
     "lint": "eslint 'src/**/*.ts'",
     "lint:fix": "eslint 'src/**/*.ts' --fix",
-    "format": "prettier --write 'src/**/*.ts'"
+    "format": "prettier --write 'src/**/*.ts'",
+    "test:unit": "vitest run"
   },
   "dependencies": {
     "@nestjs/common": "^10.4.8",
@@ -34,6 +35,7 @@
     "eslint-config-prettier": "^10.1.8",
     "prettier": "^3.8.3",
     "ts-node": "^10.9.2",
-    "typescript": "^5.7.2"
+    "typescript": "^5.7.2",
+    "vitest": "^4.1.6"
   }
 }