Feat/creatorlist boundary guard

[shogun444]

Summary

Adds a reusable guard to normalize creator list page values in public endpoints.

Changes

• Introduced normalizeCreatorListPage in creator-list-page.guard.ts
• Applied the guard in httpListCreators to normalize incoming page query values
• Added a minimal unit test for page normalization behavior

Implementation Details

• Guard is a pure, deterministic function with no side effects
• Invalid or non-integer values fall back to a default page (1)
• Page values are clamped within a safe range (min: 1, max: 100)
• No changes made to pagination logic or response structure

Testing

• Verified:
  • undefined and non-numeric values default to 1
  • values below minimum normalize to 1
  • values above maximum are clamped
  • valid page values remain unchanged

Notes

• No breaking changes introduced
• Behavior is consistent and reusable across creator list endpoints

Closes #86

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