Can start Matrix authentication from UI

matrixgw_frontend/src/api/MatrixLinkApi.ts

@@ -0,0 +1,15 @@
+import { APIClient } from "./ApiClient";
+
+export class MatrixLinkApi {
+  /**
+   * Start Matrix Account login
+   */
+  static async StartAuth(): Promise<{ url: string }> {
+    return (
+      await APIClient.exec({
+        uri: "/matrix_link/start_auth",
+        method: "POST",
+      })
+    ).data;
+  }
+}