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/Models/MessageCenterModels.swift

@@ -32,6 +32,46 @@ enum MessageJSONValue: Decodable, Hashable, Sendable {
     }
 }
 
+/// 消息未读数量响应，用于同步首页红点和桌面图标角标。
+struct MessageUnreadCountResponse: Decodable, Equatable, Sendable {
+    let unreadCount: Int
+
+    enum CodingKeys: String, CodingKey {
+        case unreadCount = "unread_count"
+    }
+
+    init(unreadCount: Int = 0) {
+        self.unreadCount = max(unreadCount, 0)
+    }
+
+    init(from decoder: Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        unreadCount = max(try container.decodeLossyInt(forKey: .unreadCount) ?? 0, 0)
+    }
+}
+
+/// 全部标记已读响应，包含本次更新数量和操作后的未读数量。
+struct MessageReadAllResponse: Decodable, Equatable, Sendable {
+    let updatedCount: Int
+    let unreadCount: Int
+
+    enum CodingKeys: String, CodingKey {
+        case updatedCount = "updated_count"
+        case unreadCount = "unread_count"
+    }
+
+    init(updatedCount: Int = 0, unreadCount: Int = 0) {
+        self.updatedCount = max(updatedCount, 0)
+        self.unreadCount = max(unreadCount, 0)
+    }
+
+    init(from decoder: Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        updatedCount = max(try container.decodeLossyInt(forKey: .updatedCount) ?? 0, 0)
+        unreadCount = max(try container.decodeLossyInt(forKey: .unreadCount) ?? 0, 0)
+    }
+}
+
 /// 消息中心列表响应，对齐 Android `MsgResponse`。
 struct MessageListResponse: Decodable, Equatable, Sendable {
     let hasMore: Bool