test: validate meta.total reflects filtered creator count

[techAlhaji]

Closes #512

Summary

Adds an integration test to verify that the creator listing endpoint reports the correct filtered total when a price range filter is applied.

Changes

• Added an integration test for the creator listing endpoint
• Seeded five creators with varying prices
• Applied a price range filter matching exactly three creators
• Verified meta.total reports the filtered count rather than the total number of creators
• Verified the returned data array length matches meta.total

Acceptance Criteria Covered

• ✅ meta.total reflects the filtered creator count
• ✅ data.length === meta.total
• ✅ Regression protection added for future filtering changes

Testing

Added coverage for:

• unfiltered creator listing (existing behavior unchanged)
• filtered creator listing
• pagination metadata consistency
• filtered count matches returned records

Verification

Executed:

• npm test
• npm run build (if applicable)

Notes

• Test-only change
• No production logic modified unless required to fix the failing behavior
• Existing API contract remains unchanged

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