test: add creator list load integration test (#359)

[temisan0x]

Summary

Adds an integration test that seeds a large creator fixture and asserts the GET /api/v1/creators endpoint responds within a defined time budget, catching query or indexing regressions before they reach production.

Changes

• src/__tests__/integration/creator-list-load.test.ts — new integration test
• package.json — added supertest and @types/supertest as devDependencies

Test details

Constant	Value
CREATOR_FIXTURE_SIZE	500
RESPONSE_TIME_BUDGET_MS	2000ms

How to run

pnpm exec jest src/__tests__/integration/creator-list-load.test.ts --runInBand

Checklist

• Named constants define fixture size and time budget
• Seed and teardown are scoped to test records only
• Test fails if response time exceeds the budget
• supertest added to devDependencies
• No changes outside test folder and package.json

Closes #359

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