Add contractors section to residence detail and fix search filtering

- Add GET /contractors/by-residence/:id endpoint integration
- Display contractors on residence detail screen (iOS & Android)
- Fix contractor search/filter to use client-side filtering
- Backend doesn't support search query params, so filter locally

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

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

iosApp/iosApp/Residence/ResidenceDetailView.swift

@@ -10,6 +10,10 @@ struct ResidenceDetailView: View {
     @State private var tasksResponse: TaskColumnsResponse?
     @State private var isLoadingTasks = false
     @State private var tasksError: String?
+
+    @State private var contractors: [ContractorSummary] = []
+    @State private var isLoadingContractors = false
+    @State private var contractorsError: String?
     
     @State private var showAddTask = false
     @State private var showEditResidence = false
@@ -198,9 +202,12 @@ private extension ResidenceDetailView {
                 PropertyHeaderCard(residence: residence)
                     .padding(.horizontal)
                     .padding(.top)
-                
+
                 tasksSection
                     .padding(.horizontal)
+
+                contractorsSection
+                    .padding(.horizontal)
             }
             .padding(.bottom)
         }
@@ -226,6 +233,67 @@ private extension ResidenceDetailView {
                 .padding()
         }
     }
+
+    @ViewBuilder
+    var contractorsSection: some View {
+        VStack(alignment: .leading, spacing: AppSpacing.md) {
+            // Section Header
+            HStack(spacing: AppSpacing.sm) {
+                Image(systemName: "person.2.fill")
+                    .font(.title2)
+                    .foregroundColor(Color.appPrimary)
+                Text("Contractors")
+                    .font(.title2.weight(.bold))
+                    .foregroundColor(Color.appPrimary)
+            }
+            .padding(.top, AppSpacing.sm)
+
+            if isLoadingContractors {
+                HStack {
+                    Spacer()
+                    ProgressView()
+                    Spacer()
+                }
+                .padding()
+            } else if let error = contractorsError {
+                Text("Error: \(error)")
+                    .foregroundColor(Color.appError)
+                    .padding()
+            } else if contractors.isEmpty {
+                // Empty state
+                VStack(spacing: AppSpacing.md) {
+                    Image(systemName: "person.crop.circle.badge.plus")
+                        .font(.system(size: 48))
+                        .foregroundColor(Color.appTextSecondary.opacity(0.6))
+                    Text("No contractors yet")
+                        .font(.headline)
+                        .foregroundColor(Color.appTextPrimary)
+                    Text("Add contractors from the Contractors tab")
+                        .font(.subheadline)
+                        .foregroundColor(Color.appTextSecondary)
+                }
+                .frame(maxWidth: .infinity)
+                .padding(AppSpacing.xl)
+                .background(Color.appBackgroundSecondary)
+                .cornerRadius(AppRadius.lg)
+            } else {
+                // Contractors list
+                VStack(spacing: AppSpacing.sm) {
+                    ForEach(contractors, id: \.id) { contractor in
+                        NavigationLink(destination: ContractorDetailView(contractorId: contractor.id)) {
+                            ContractorCard(
+                                contractor: contractor,
+                                onToggleFavorite: {
+                                    // Could implement toggle favorite here if needed
+                                }
+                            )
+                        }
+                        .buttonStyle(PlainButtonStyle())
+                    }
+                }
+            }
+        }
+    }
 }
 
 // MARK: - Toolbars
@@ -299,6 +367,7 @@ private extension ResidenceDetailView {
     func loadResidenceData() {
         viewModel.getResidence(id: residenceId)
         loadResidenceTasks()
+        loadResidenceContractors()
     }
     
     func loadResidenceTasks() {
@@ -365,6 +434,39 @@ private extension ResidenceDetailView {
             }
         }
     }
+
+    func loadResidenceContractors() {
+        guard TokenStorage.shared.getToken() != nil else { return }
+
+        isLoadingContractors = true
+        contractorsError = nil
+
+        Task {
+            do {
+                let result = try await APILayer.shared.getContractorsByResidence(
+                    residenceId: Int32(Int(residenceId))
+                )
+
+                await MainActor.run {
+                    if let successResult = result as? ApiResultSuccess<NSArray> {
+                        self.contractors = (successResult.data as? [ContractorSummary]) ?? []
+                        self.isLoadingContractors = false
+                    } else if let errorResult = result as? ApiResultError {
+                        self.contractorsError = errorResult.message
+                        self.isLoadingContractors = false
+                    } else {
+                        self.contractorsError = "Failed to load contractors"
+                        self.isLoadingContractors = false
+                    }
+                }
+            } catch {
+                await MainActor.run {
+                    self.contractorsError = error.localizedDescription
+                    self.isLoadingContractors = false
+                }
+            }
+        }
+    }
 }
 
 private struct TasksSectionContainer: View {