Remove API pagination and fix contractor UI issues

- Remove pagination from all Django REST Framework endpoints
- Update Kotlin API clients to return direct lists instead of paginated responses
- Update iOS ViewModels to handle direct list responses
- Remove ContractorListResponse, DocumentListResponse, and PaginatedResponse models
- Fix contractor form specialty selector loading with improved DataCache access
- Fix contractor sheet presentation to use full screen (.presentationDetents([.large]))
- Improve UI test scrolling to handle lists of any size with smart end detection

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

iosApp/iosApp/Documents/DocumentViewModelWrapper.swift

@@ -94,8 +94,8 @@ class DocumentViewModelWrapper: ObservableObject {
                 )
 
                 await MainActor.run {
-                    if let success = result as? ApiResultSuccess<DocumentListResponse> {
-                        let documents = success.data?.results as? [Document] ?? []
+                    if let success = result as? ApiResultSuccess<NSArray> {
+                        let documents = success.data as? [Document] ?? []
                         self.documentsState = DocumentStateSuccess(documents: documents)
                     } else if let error = result as? ApiResultError {
                         self.documentsState = DocumentStateError(message: error.message)