style: apply prettier across the tree

One-shot prettier pass so the new format:check gate starts from a clean
baseline. Formatting only — no behaviour change. Generator-owned and
vendored artifacts stay untouched via .prettierignore.

src/__tests__/api/auth/check-user/route.test.ts

@@ -62,10 +62,7 @@ vi.mock("next/headers", () => ({
 
 import { POST } from "@/app/api/auth/check-user/route";
 import { prisma } from "@/lib/db";
-import {
-  checkRateLimit,
-  checkAuthSurfaceRateLimit,
-} from "@/lib/rate-limit";
+import { checkRateLimit, checkAuthSurfaceRateLimit } from "@/lib/rate-limit";
 
 interface CheckUserBody {
   data: {