상위 디렉터리 및 카테고리의 소유권을 검증하지 않던 문제 등 버그 수정 및 Vitest 기반 테스트 추가

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

vitest.config.ts

@@ -0,0 +1,28 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    projects: [
+      {
+        extends: true,
+        test: {
+          name: "unit",
+          include: ["tests/unit/**/*.test.ts"],
+          setupFiles: ["tests/setup/polyfills.ts"],
+        },
+      },
+      {
+        extends: true,
+        test: {
+          name: "server",
+          include: ["tests/server/**/*.test.ts"],
+          globalSetup: ["tests/setup/database.ts"],
+          setupFiles: ["tests/setup/server.ts"],
+          // Test files share a single database
+          fileParallelism: false,
+          hookTimeout: 60_000,
+        },
+      },
+    ],
+  },
+});