Add contractor management and integrate with task completions

Features:
- Add full contractor CRUD functionality (Android & iOS)
- Add contractor selection to task completion dialog
- Display contractor info in completion cards
- Add ContractorSpecialty model and API integration
- Add contractors tab to bottom navigation
- Replace hardcoded specialty lists with API data
- Update lookup endpoints to return arrays instead of paginated responses

Changes:
- Add Contractor models (ContractorSummary, ContractorDetail, ContractorCreate/UpdateRequest)
- Add ContractorApi with endpoints for list, detail, create, update, delete, toggle favorite
- Add ContractorViewModel for state management
- Add ContractorsScreen and ContractorDetailScreen for Android
- Add AddContractorDialog with form validation
- Add Contractor views for iOS (list, detail, form)
- Update CompleteTaskDialog to include contractor selection
- Update CompletionCardView to show contractor name and phone
- Add contractor field to TaskCompletion model
- Update LookupsApi to return List<T> instead of paginated responses
- Update LookupsRepository and LookupsViewModel to handle array responses
- Update LookupsManager (iOS) to handle array responses for contractor specialties

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

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

iosApp/iosApp/Subviews/Task/CompletionCardView.swift

@@ -31,7 +31,27 @@ struct CompletionCardView: View {
                 }
             }
 
-            if let completedBy = completion.completedByName {
+            // Display contractor or manual entry
+            if let contractorDetails = completion.contractorDetails {
+                HStack(alignment: .top, spacing: 6) {
+                    Image(systemName: "wrench.and.screwdriver")
+                        .font(.caption2)
+                        .foregroundColor(AppColors.primary)
+
+                    VStack(alignment: .leading, spacing: 2) {
+                        Text("By: \(contractorDetails.name)")
+                            .font(.caption2)
+                            .fontWeight(.medium)
+                            .foregroundColor(.primary)
+
+                        if let company = contractorDetails.company {
+                            Text(company)
+                                .font(.caption2)
+                                .foregroundColor(.secondary)
+                        }
+                    }
+                }
+            } else if let completedBy = completion.completedByName {
                 Text("By: \(completedBy)")
                     .font(.caption2)
                     .foregroundColor(.secondary)