feat(ios): Enhance battery optimization and notification management

Description:
- Add battery status and power state monitoring
- Implement adaptive scheduling based on battery levels
- Add maintenance worker for background tasks
- Enhance logging with structured DailyNotificationLogger
- Add configuration management with DailyNotificationConfig
- Define constants in DailyNotificationConstants
- Improve error handling and recovery mechanisms

Testing:
- Add comprehensive test coverage for battery optimization
- Add test coverage for power state management
- Add test coverage for maintenance tasks
- Add test coverage for configuration management
- Add test coverage for constants validation

Documentation:
- Add comprehensive file-level documentation
- Add method-level documentation
- Add test documentation
- Add configuration documentation

This commit improves the iOS implementation's reliability and battery
efficiency by adding robust error handling, logging, and configuration
management to make the plugin more maintainable and debuggable.

ios/Plugin/DailyNotificationPlugin.swift

@@ -16,6 +16,8 @@ import UserNotifications
 @objc(DailyNotificationPlugin)
 public class DailyNotificationPlugin: CAPPlugin {
     private let notificationCenter = UNUserNotificationCenter.current()
+    private let powerManager = DailyNotificationPowerManager.shared
+    private let maintenanceWorker = DailyNotificationMaintenanceWorker.shared
     
     private var settings: [String: Any] = [
         "sound": true,
@@ -39,6 +41,15 @@ public class DailyNotificationPlugin: CAPPlugin {
             return
         }
         
+        // Check battery optimization status
+        let batteryStatus = powerManager.getBatteryStatus()
+        if batteryStatus["level"] as? Int ?? 100 < DailyNotificationConfig.BatteryThresholds.critical {
+            DailyNotificationLogger.shared.log(
+                .warning,
+                "Warning: Battery level is critical"
+            )
+        }
+        
         // Parse time string (HH:mm format)
         let timeComponents = time.split(separator: ":")
         guard timeComponents.count == 2,
@@ -52,8 +63,8 @@ public class DailyNotificationPlugin: CAPPlugin {
         
         // Create notification content
         let content = UNMutableNotificationContent()
-        content.title = call.getString("title") ?? "Daily Notification"
-        content.body = call.getString("body") ?? "Your daily update is ready"
+        content.title = call.getString("title") ?? DailyNotificationConstants.defaultTitle
+        content.body = call.getString("body") ?? DailyNotificationConstants.defaultBody
         content.sound = call.getBool("sound", true) ? .default : nil
         
         // Set priority
@@ -110,8 +121,16 @@ public class DailyNotificationPlugin: CAPPlugin {
         // Schedule notification
         notificationCenter.add(request) { error in
             if let error = error {
+                DailyNotificationLogger.shared.log(
+                    .error,
+                    "Failed to schedule notification: \(error.localizedDescription)"
+                )
                 call.reject("Failed to schedule notification: \(error.localizedDescription)")
             } else {
+                DailyNotificationLogger.shared.log(
+                    .info,
+                    "Successfully scheduled notification for \(time)"
+                )
                 call.resolve()
             }
         }
@@ -255,8 +274,25 @@ public class DailyNotificationPlugin: CAPPlugin {
         }
     }
     
+    @objc func getBatteryStatus(_ call: CAPPluginCall) {
+        let status = powerManager.getBatteryStatus()
+        call.resolve(status)
+    }
+    
+    @objc func getPowerState(_ call: CAPPluginCall) {
+        let state = powerManager.getPowerState()
+        call.resolve(state)
+    }
+    
+    @objc func setAdaptiveScheduling(_ call: CAPPluginCall) {
+        let enabled = call.getBool("enabled", true)
+        powerManager.setAdaptiveScheduling(enabled)
+        call.resolve()
+    }
+    
     public override func load() {
         notificationCenter.delegate = self
+        maintenanceWorker.scheduleNextMaintenance()
     }
     
     private func isValidTime(_ time: String) -> Bool {