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/Contractor/ContractorFormSheet.swift

@@ -38,7 +38,7 @@ struct ContractorFormSheet: View {
     @State private var contractorSpecialties: [ContractorSpecialty] = []
 
     private var specialties: [String] {
-        contractorSpecialties.map { $0.name }
+        return DataCache.shared.contractorSpecialties.value.map { $0.name }
     }
 
     private var canSave: Bool {
@@ -290,11 +290,10 @@ struct ContractorFormSheet: View {
                         }
                     }
                 }
-                .presentationDetents([.medium, .large])
+                .presentationDetents([.large])
             }
             .onAppear {
                 loadContractorData()
-                loadContractorSpecialties()
             }
             .handleErrors(
                 error: viewModel.errorMessage,
@@ -324,16 +323,6 @@ struct ContractorFormSheet: View {
         isFavorite = contractor.isFavorite
     }
 
-    private func loadContractorSpecialties() {
-        Task {
-            await MainActor.run {
-                if let specialties = DataCache.shared.contractorSpecialties.value as? [ContractorSpecialty] {
-                    self.contractorSpecialties = specialties
-                }
-            }
-        }
-    }
-
     // MARK: - Save Action
 
     private func saveContractor() {