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/API/MessageCenterAPI.swift

@@ -11,8 +11,14 @@ protocol MessageCenterServing {
     /// 拉取消息列表。
     func list(lastId: Int, limit: Int, unread: Int) async throws -> MessageListResponse
 
-    /// 标记消息已读。
-    func markAsRead(messageId: Int) async throws
+    /// 获取当前账号未读消息总数。
+    func unreadCount() async throws -> MessageUnreadCountResponse
+
+    /// 标记消息已读并返回最新未读数量。
+    func markAsRead(messageId: Int) async throws -> MessageUnreadCountResponse
+
+    /// 将当前账号全部消息标记已读。
+    func markAllAsRead() async throws -> MessageReadAllResponse
 
     /// 删除消息。
     func delete(messageId: Int) async throws
@@ -43,9 +49,16 @@ final class MessageCenterAPI: MessageCenterServing {
         )
     }
 
+    /// GET /api/app/msg/unread-count
+    func unreadCount() async throws -> MessageUnreadCountResponse {
+        try await client.send(
+            APIRequest(method: .get, path: "/api/app/msg/unread-count")
+        )
+    }
+
     /// POST /api/app/msg/read
-    func markAsRead(messageId: Int) async throws {
-        let _: EmptyPayload = try await client.send(
+    func markAsRead(messageId: Int) async throws -> MessageUnreadCountResponse {
+        try await client.send(
             APIRequest(
                 method: .post,
                 path: "/api/app/msg/read",
@@ -54,6 +67,13 @@ final class MessageCenterAPI: MessageCenterServing {
         )
     }
 
+    /// POST /api/app/msg/read-all
+    func markAllAsRead() async throws -> MessageReadAllResponse {
+        try await client.send(
+            APIRequest(method: .post, path: "/api/app/msg/read-all")
+        )
+    }
+
     /// POST /api/app/msg/delete
     func delete(messageId: Int) async throws {
         let _: EmptyPayload = try await client.send(