Fix code review issues in AppZone

- Added databaseTableName static property to AppZone
- Fixed updateInRegion mutating method to update self
- Addressed all code review comments

Co-authored-by: bgoncal <5808343+bgoncal@users.noreply.github.com>

Author: Copilot

Sources/Shared/API/Models/AppZone+Queries.swift

@@ -104,5 +104,6 @@ public extension AppZone {
         try Current.database().write { db in
             try updatedZone.update(db)
         }
+        self = updatedZone
     }
 }

Sources/Shared/API/Models/AppZone.swift

@@ -4,6 +4,8 @@ import GRDB
 import HAKit
 
 public struct AppZone: Codable, FetchableRecord, PersistableRecord {
+    public static let databaseTableName = GRDBDatabaseTable.appZone.rawValue
+    
     /// serverId/entityId (e.g., "server1/zone.home")
     public let id: String
     public let serverId: String