feat: 接入消息未读数、全部已读与首页红点角标同步。

固定消息中心为首页入口，并在推送到达、已读后刷新桌面角标。

Co-authored-by: Cursor <cursoragent@cursor.com>

suixinkan/Features/MessageCenter/ViewModels/MessageCenterViewModels.swift

@@ -11,11 +11,13 @@ final class MessageCenterViewModel {
     private(set) var isLoading = false
     private(set) var isRefreshing = false
     private(set) var isLoadingMore = false
+    private(set) var isMarkingAllAsRead = false
     private(set) var canLoadMore = false
 
     var onStateChange: (() -> Void)?
     var onShowMessage: ((String) -> Void)?
     var onOpenDetail: ((MessageItem) -> Void)?
+    var onUnreadMessageCountChange: ((Int) -> Void)?
 
     private let pageSize = 20
     private var lastId = 0
@@ -55,9 +57,10 @@ final class MessageCenterViewModel {
         }
 
         do {
-            try await api.markAsRead(messageId: id)
+            let response = try await api.markAsRead(messageId: id)
             let readItem = item.markedRead()
             items = items.map { $0.id == id ? readItem : $0 }
+            notifyUnreadMessageCountChanged(response.unreadCount)
             onOpenDetail?(readItem)
         } catch is CancellationError {
             return
@@ -66,6 +69,30 @@ final class MessageCenterViewModel {
         }
     }
 
+    /// 将当前账号的全部消息标记已读，成功时返回服务端最新统计。
+    func markAllAsRead(api: any MessageCenterServing) async -> MessageReadAllResponse? {
+        guard !isLoading, !isMarkingAllAsRead else { return nil }
+        isMarkingAllAsRead = true
+        notifyStateChange()
+        defer {
+            isMarkingAllAsRead = false
+            notifyStateChange()
+        }
+
+        do {
+            let response = try await api.markAllAsRead()
+            items = items.map { $0.isRead ? $0 : $0.markedRead() }
+            notifyUnreadMessageCountChanged(response.unreadCount)
+            onShowMessage?(response.updatedCount > 0 ? "已全部标记为已读" : "暂无未读消息")
+            return response
+        } catch is CancellationError {
+            return nil
+        } catch {
+            onShowMessage?("全部标记已读失败，请稍后重试")
+            return nil
+        }
+    }
+
     /// 删除后从本地列表移除消息。
     func removeMessage(id: Int) {
         items.removeAll { $0.id == id }
@@ -110,6 +137,16 @@ final class MessageCenterViewModel {
     private func notifyStateChange() {
         onStateChange?()
     }
+
+    private func notifyUnreadMessageCountChanged(_ count: Int) {
+        let normalizedCount = max(count, 0)
+        onUnreadMessageCountChange?(normalizedCount)
+        NotificationCenter.default.post(
+            name: NotificationName.unreadMessageCountDidChange,
+            object: nil,
+            userInfo: [NotificationUserInfoKey.unreadCount: normalizedCount]
+        )
+    }
 }
 
 /// 消息详情页 ViewModel，负责删除当前消息。