feat: session secondary

Closes #837

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/grpc/space.dart

@@ -0,0 +1,31 @@
+import 'package:PiliPlus/grpc/bilibili/app/dynamic/v2.pb.dart';
+import 'package:PiliPlus/grpc/bilibili/pagination.pb.dart';
+import 'package:PiliPlus/grpc/grpc_repo.dart';
+import 'package:PiliPlus/http/loading_state.dart';
+import 'package:fixnum/fixnum.dart';
+
+class SpaceGrpc {
+  static Future<LoadingState<OpusSpaceFlowResp>> opusSpaceFlow({
+    required int hostMid,
+    String? next,
+    required String filterType,
+  }) async {
+    final res = await GrpcRepo.request(
+      GrpcUrl.opusSpaceFlow,
+      OpusSpaceFlowReq(
+        hostMid: Int64(hostMid),
+        pagination: Pagination(
+          pageSize: 20,
+          next: next,
+        ),
+        filterType: filterType,
+      ),
+      OpusSpaceFlowResp.fromBuffer,
+    );
+    if (res['status']) {
+      return LoadingState.success(res['data']);
+    } else {
+      return LoadingState.error(res['msg']);
+    }
+  }
+}