feat: migrate fal workflow to server (#7581)

packages/backend/server/tests/copilot.spec.ts

@@ -717,6 +717,8 @@ test.skip('should be able to preview workflow', async t => {
       console.log('enter node:', ret.node.name);
     } else if (ret.status === GraphExecutorState.ExitNode) {
       console.log('exit node:', ret.node.name);
+    } else if (ret.status === GraphExecutorState.EmitAttachment) {
+      console.log('stream attachment:', ret);
     } else {
       result += ret.content;
       // console.log('stream result:', ret);
@@ -1020,9 +1022,9 @@ test('should be able to run image executor', async t => {
       ret,
       Array.from(['https://example.com/test.jpg', 'tag1, tag2, tag3, ']).map(
         t => ({
-          content: t,
+          attachment: t,
           nodeId: 'basic',
-          type: NodeExecuteState.Content,
+          type: NodeExecuteState.Attachment,
         })
       )
     );