Add pagination support for item tags list

[dadachi]

Summary

• Add PaginationMeta model to parse pagination metadata from JSON:API meta response
• Add queryItems support to the Request protocol and Service networking layer for URL query parameters
• Update GetItemTagsRequest to accept optional page parameter and return ItemTagsResponse with pagination meta
• Add reloadPage(shopId:page:) and loadNextPage(shopId:) to ItemTagRepository for paginated fetching
• Add infinite scroll (load more) row in ItemTagListView with ProgressView spinner
• ShopDetailView continues fetching all items without pagination for backward compatibility
• Add comprehensive tests for PaginationMeta and new ItemTagListViewModel pagination behavior

Test plan

• make lint passes (0 violations)
• Build succeeds
• All PaginationMetaTest tests pass (8 tests)
• All ItemTagListViewModelTest tests pass (including new pagination tests)
• Manual test: item tag list loads first page, scrolling to bottom loads next page
• Manual test: pull-to-refresh resets to page 1
• Manual test: ShopDetailView still loads all items without pagination

🤖 Generated with Claude Code