Fix tests for refactored Search and SearchResponse classes

[Copilot]

The DataProvider refactoring introduced top-level Search and SearchResponse classes, breaking tests that referenced the old nested DataProvider.SearchResponse.

Test updates:

• Import and use Search and SearchResponse as top-level classes
• Instantiate SearchResponse with new Search object instead of individual parameters:

  # Before
  DataProvider.SearchResponse(
      provider=cls, query=q, limit=50, offset=0, sort=None, records=[], total=0
  )
  
  # After  
  SearchResponse(
      provider=cls, search=Search(query=q, limit=50, offset=0, sort=None), records=[], total=0
  )

SearchResponse enhancements:

• Added limit, title properties and get_search_url(page) method for pagination
• Fixed __getitem__ to raise KeyError for Mapping interface compliance
• Improved URL template parsing from split('{')[0] to [:index('{')]

Models updates:

• Removed duplicate Search dataclass from models.py
• Changed type hints from 'DataProvider.SearchResponse' to 'SearchResponse'
• Added itemsPerPage and currentPage fields to Metadata for pagination
• Exported Search and SearchResponse in public API

All 27 tests now pass with no security issues.

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