[BE-TEST-019] be-test: Add tests for pagination
- Created comprehensive pagination test suite for all list endpoints
- Tests cover tracks, users, and playlists endpoints
- Tests verify default pagination (page=1, limit=20)
- Tests verify custom pagination parameters
- Tests verify invalid parameter validation and correction
- Tests verify pagination metadata (total, total_pages, has_next, has_prev)
- Tests verify navigation between pages
- Tests verify edge cases (empty query, large page numbers, max limit)
- Tests verify total count accuracy
- Tests verify consistency across all endpoints
Phase: PHASE-5
Priority: P2
Progress: 140/267 (52.43%)
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