Add comprehensive i18n localization for KMM and iOS

KMM (Android/Shared):
- Add strings.xml with 200+ localized strings
- Add translation files for es, fr, de, pt languages
- Update all screens to use stringResource() for i18n
- Add Accept-Language header to API client for all platforms

iOS:
- Add L10n.swift helper with type-safe string accessors
- Add Localizable.xcstrings with translations for all 5 languages
- Update all SwiftUI views to use L10n.* for localized strings
- Localize Auth, Residence, Task, Contractor, Document, and Profile views

Supported languages: English, Spanish, French, German, Portuguese

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

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

iosApp/iosApp/Task/AllTasksView.swift

@@ -57,11 +57,11 @@ struct AllTasksView: View {
             .sheet(isPresented: $showingUpgradePrompt) {
                 UpgradePromptView(triggerKey: "add_11th_task", isPresented: $showingUpgradePrompt)
             }
-            .alert("Archive Task", isPresented: $showArchiveConfirmation) {
-                Button("Cancel", role: .cancel) {
+            .alert(L10n.Tasks.archiveTask, isPresented: $showArchiveConfirmation) {
+                Button(L10n.Common.cancel, role: .cancel) {
                     selectedTaskForArchive = nil
                 }
-                Button("Archive", role: .destructive) {
+                Button(L10n.Tasks.archive, role: .destructive) {
                     if let task = selectedTaskForArchive {
                         taskViewModel.archiveTask(id: task.id) { _ in
                             loadAllTasks()
@@ -71,14 +71,14 @@ struct AllTasksView: View {
                 }
             } message: {
                 if let task = selectedTaskForArchive {
-                    Text("Are you sure you want to archive \"\(task.title)\"? You can unarchive it later from archived tasks.")
+                    Text(L10n.Tasks.archiveConfirm.replacingOccurrences(of: "this task", with: "\"\(task.title)\""))
                 }
             }
-            .alert("Delete Task", isPresented: $showCancelConfirmation) {
-                Button("Cancel", role: .cancel) {
+            .alert(L10n.Tasks.deleteTask, isPresented: $showCancelConfirmation) {
+                Button(L10n.Common.cancel, role: .cancel) {
                     selectedTaskForCancel = nil
                 }
-                Button("Archive", role: .destructive) {
+                Button(L10n.Tasks.archive, role: .destructive) {
                     if let task = selectedTaskForCancel {
                         taskViewModel.cancelTask(id: task.id) { _ in
                             loadAllTasks()
@@ -88,7 +88,7 @@ struct AllTasksView: View {
                 }
             } message: {
                 if let task = selectedTaskForCancel {
-                    Text("Are you sure you want to archive \"\(task.title)\"? You can unarchive it later from archived tasks.")
+                    Text(L10n.Tasks.archiveConfirm.replacingOccurrences(of: "this task", with: "\"\(task.title)\""))
                 }
             }
             .onChange(of: showAddTask) { isShowing in
@@ -129,16 +129,16 @@ struct AllTasksView: View {
                             .font(.system(size: 64))
                             .foregroundStyle(Color.appPrimary.opacity(0.6))
 
-                        Text("No tasks yet")
+                        Text(L10n.Tasks.noTasksYet)
                             .font(.title2)
                             .fontWeight(.semibold)
                             .foregroundColor(Color.appTextPrimary)
 
-                        Text("Create your first task to get started")
+                        Text(L10n.Tasks.createFirst)
                             .font(.body)
                             .foregroundColor(Color.appTextSecondary)
                             .multilineTextAlignment(.center)
-                        
+
                         Button(action: {
                             // Check if we should show upgrade prompt before adding
                             if subscriptionCache.shouldShowUpgradePrompt(currentCount: totalTaskCount, limitKey: "tasks") {
@@ -149,7 +149,7 @@ struct AllTasksView: View {
                         }) {
                             HStack(spacing: 8) {
                                 Image(systemName: "plus")
-                                Text("Add Task")
+                                Text(L10n.Tasks.addButton)
                                     .fontWeight(.semibold)
                             }
                             .frame(maxWidth: .infinity)
@@ -160,13 +160,13 @@ struct AllTasksView: View {
                         .padding(.horizontal, 48)
                         .disabled(residenceViewModel.myResidences?.residences.isEmpty ?? true)
                         .accessibilityIdentifier(AccessibilityIdentifiers.Task.addButton)
-                        
+
                         if residenceViewModel.myResidences?.residences.isEmpty ?? true {
-                            Text("Add a property first from the Residences tab")
+                            Text(L10n.Tasks.addPropertyFirst)
                                 .font(.caption)
                                 .foregroundColor(Color.appError)
                         }
-                        
+
                         Spacer()
                     }
                     .padding()
@@ -235,7 +235,7 @@ struct AllTasksView: View {
         }
         .scrollContentBackground(.hidden)
         .background(Color.appBackgroundPrimary)
-        .navigationTitle("All Tasks")
+        .navigationTitle(L10n.Tasks.allTasks)
         .navigationBarTitleDisplayMode(.inline)
         .toolbar {
             ToolbarItem(placement: .navigationBarTrailing) {