feat: add FlowCanvas (#593)

### What problem does this PR solve?

feat: handle operator drag
feat: add FlowCanvas
#592

### Type of change

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

web/src/routes.ts

@@ -84,6 +84,10 @@ const routes = [
         path: '/file',
         component: '@/pages/file-manager',
       },
+      {
+        path: '/flow',
+        component: '@/pages/flow',
+      },
     ],
   },
   {