chore: migrate server tests from Jest to Vitest

server/tsconfig.json

@@ -20,6 +20,7 @@
     "forceConsistentCasingInFileNames": true,
     "noImplicitAny": false,
     "strictBindCallApply": false,
-    "noFallthroughCasesInSwitch": false
+    "noFallthroughCasesInSwitch": false,
+    "types": ["vitest/globals"]
   }
 }