fix(ios): make PersistenceController public for build access

Fixed build error: 'cannot find PersistenceController in scope'

Changes:
- Made PersistenceController class public
- Made shared static property public
- Made container property public
- Made init method public

This allows DailyNotificationPlugin to access PersistenceController
across module boundaries. CocoaPods pod install was required to
regenerate project files with updated access modifiers.

Result: iOS plugin now builds successfully

ios/Plugin/DailyNotificationModel.swift

@@ -115,12 +115,12 @@ extension History: Identifiable {
 }
 
 // MARK: - Persistence Controller
-class PersistenceController {
+public class PersistenceController {
-    static let shared = PersistenceController()
+    public static let shared = PersistenceController()
     
-    let container: NSPersistentContainer
+    public let container: NSPersistentContainer
     
-    init(inMemory: Bool = false) {
+    public init(inMemory: Bool = false) {
         container = NSPersistentContainer(name: "DailyNotificationModel")
         
         if inMemory {