Update Kotlin models and iOS Swift to align with new Go API format

- Update all Kotlin API models to match Go API response structures
- Fix Swift type aliases (TaskDetail→TaskResponse, Residence→ResidenceResponse, etc.)
- Update TaskCompletionCreateRequest to simplified Go API format (taskId, notes, actualCost, photoUrl)
- Fix optional handling for frequency, priority, category, status in task models
- Replace isPrimaryOwner with ownerId comparison against current user
- Update ResidenceUsersResponse to use owner.id instead of ownerId
- Fix non-optional String fields to use isEmpty checks instead of optional binding
- Add type aliases for backwards compatibility in Kotlin models

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

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

iosApp/iosApp/Extensions/TaskDetailExtensions.swift

@@ -1,8 +1,8 @@
 import Foundation
 import ComposeApp
 
-// Extension to make TaskDetail conform to Identifiable for SwiftUI
-extension TaskDetail: Identifiable {
+// Extension to make TaskResponse conform to Identifiable for SwiftUI
+extension TaskResponse: Identifiable {
     // TaskDetail already has an `id` property from Kotlin,
     // so we just need to declare conformance to Identifiable
 }