refactor: ♻️ rewrite migrations frontend/backend (#841)

* refactor(frontend): ♻️ rewrite migrations UI

* refactor(backend): ♻️ rewrite recipe migrations

* remove vue-demi

Co-authored-by: hay-kot <hay-kot@pm.me>

frontend/api/class-interfaces/group-migrations.ts

@@ -0,0 +1,27 @@
+import { BaseAPI } from "../_base";
+import { ReportSummary } from "./group-reports";
+
+const prefix = "/api";
+
+export type SupportedMigration = "nextcloud" | "chowdown";
+
+export interface MigrationPayload {
+  migrationType: SupportedMigration;
+  archive: File;
+}
+
+const routes = {
+  base: `${prefix}/groups/migrations`,
+};
+
+export class GroupMigrationApi extends BaseAPI {
+  async startMigration(payload: MigrationPayload) {
+    const form = new FormData();
+    form.append("migration_type", payload.migrationType);
+    form.append("archive", payload.archive);
+
+    console.log(form);
+
+    return await this.requests.post<ReportSummary>(routes.base, form);
+  }
+}