test: restore real timers after rate limit tests

[fathiaoyinloye]

closes #710

Description

Restored real timers after each test in the rate-limit test suite by adding afterEach(() => { vi.useRealTimers(); }) to src/app/api/tutorials/__tests__/ratelimit.test.ts.

This isolates fake timer usage to the test suite that requires it, preventing timer state from leaking into other test files and reducing order-dependent test flakiness.

Related Issue

Closes #

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Checklist

• Code follows project style guidelines
• Self-review completed
• No console errors
• Uses Lucide icons consistently
• Responsive design implemented
• Starknet best practices followed

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