feat: add custom edge (#1061)

### What problem does this PR solve?
feat: add custom edge
feat: add flow card
feat: add store for canvas
#918 

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/services/flow-service.ts

@@ -0,0 +1,43 @@
+import api from '@/utils/api';
+import registerServer from '@/utils/registerServer';
+import request from '@/utils/request';
+
+const {
+  getCanvas,
+  setCanvas,
+  listCanvas,
+  resetCanvas,
+  removeCanvas,
+  listTemplates,
+} = api;
+
+const methods = {
+  getCanvas: {
+    url: getCanvas,
+    method: 'get',
+  },
+  setCanvas: {
+    url: setCanvas,
+    method: 'post',
+  },
+  listCanvas: {
+    url: listCanvas,
+    method: 'get',
+  },
+  resetCanvas: {
+    url: resetCanvas,
+    method: 'post',
+  },
+  removeCanvas: {
+    url: removeCanvas,
+    method: 'post',
+  },
+  listTemplates: {
+    url: listTemplates,
+    method: 'get',
+  },
+} as const;
+
+const chatService = registerServer<keyof typeof methods>(methods, request);
+
+export default chatService;