fix: repair PR verification and docs cleanup

server/rate-limiter.test.mjs

@@ -1,4 +1,4 @@
-import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
 import {
     checkLeaveRoomRate,
     LEAVE_ROOM_RATE_LIMIT,
@@ -100,4 +100,4 @@ describe('Rate Limit Constants', () => {
         expect(LEAVE_ROOM_RATE_LIMIT).toBe(10);
         expect(LEAVE_ROOM_RATE_WINDOW_MS).toBe(60000); // 1 minute
     });
-});
+});