⚗️ Add NSE into macos platform

macos/SolianNotifyExt/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSUserActivityTypes</key>
+	<array>
+		<string>INStartCallIntent</string>
+		<string>INSendMessageIntent</string>
+	</array>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.usernotifications.service</string>
+		<key>NSExtensionPrincipalClass</key>
+		<string>$(PRODUCT_MODULE_NAME).NotificationService</string>
+	</dict>
+</dict>
+</plist>

macos/SolianNotifyExt/NotificationService.swift

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+//
+//  NotificationService.swift
+//  SolianNotifyExt
+//
+//  Created by LittleSheep on 2024/7/19.
+//
+
+import UserNotifications
+import Intents
+
+enum ParseNotificationPayloadError: Error {
+    case noMetadata(String)
+    case noAvatarUrl(String)
+}
+
+class NotificationService: UNNotificationServiceExtension {
+    
+    var contentHandler: ((UNNotificationContent) -> Void)?
+    var bestAttemptContent: UNMutableNotificationContent?
+    
+    override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
+        self.contentHandler = contentHandler
+        bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
+        
+        if let bestAttemptContent = bestAttemptContent {
+            do {
+                switch bestAttemptContent.categoryIdentifier {
+                case "messaging.message", "messaging.callStart":
+                    guard let metadata = bestAttemptContent.userInfo["metadata"] as? [AnyHashable : Any] else {
+                        throw ParseNotificationPayloadError.noMetadata("The notification has no metadata.")
+                    }
+                    let userId = metadata["user_id"] as! Int
+                    let userName = metadata["user_name"] as? String
+                    
+                    guard let avatarUrl = bestAttemptContent.userInfo["avatar"] as? String else {
+                        throw ParseNotificationPayloadError.noMetadata("The notification has no avatar url.")
+                    }
+                    
+                    let handle = INPersonHandle(value: String(userId), type: .unknown)
+                    let avatar = INImage(
+                        url: URL(string: avatarUrl)!
+                    )!
+                    let sender = INPerson(personHandle: handle,
+                                          nameComponents: nil,
+                                          displayName: bestAttemptContent.title,
+                                          image: avatar,
+                                          contactIdentifier: nil,
+                                          customIdentifier: userName)
+                    let intent = INSendMessageIntent(recipients: nil,
+                                                     outgoingMessageType: .outgoingMessageText,
+                                                     content: bestAttemptContent.body,
+                                                     speakableGroupName: nil,
+                                                     conversationIdentifier: String(metadata["channel_id"] as! Int),
+                                                     serviceName: "PostPigeon",
+                                                     sender: sender,
+                                                     attachments: nil)
+                    
+                    let interaction = INInteraction(intent: intent, response: nil)
+                    interaction.direction = .incoming
+                    interaction.donate(completion: nil)
+                    break
+                default:
+                    contentHandler(bestAttemptContent)
+                    break
+                }
+            } catch {
+                contentHandler(bestAttemptContent)
+            }
+        }
+    }
+    
+    override func serviceExtensionTimeWillExpire() {
+        // Called just before the extension will be terminated by the system.
+        // Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
+        if let contentHandler = contentHandler, let bestAttemptContent =  bestAttemptContent {
+            contentHandler(bestAttemptContent)
+        }
+    }
+    
+}