寻宝：抽象队长匹配队友的逻辑；抽象 channel 中的用户

shared/domain/ChannelUser.ts

@@ -0,0 +1,21 @@
+export class ChannelUser {
+    private _roleId: string;
+    private _sid: string;
+
+    constructor(uid: string, sid: string) {
+        this._roleId = uid;
+        this._sid = sid;
+    }
+
+    get uid() {
+        return this._roleId;
+    }
+
+    get roleId() {
+        return this._roleId;
+    }
+
+    get sid() {
+        return this._sid;
+    }
+}