Feat: Upload files in the chat box on the agent page #3221 (#9035)

### What problem does this PR solve?

Feat: Upload files in the chat box on the agent page #3221
### Type of change


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

web/src/utils/api.ts

@@ -152,6 +152,7 @@ export default {
   fetchVersion: (id: string) => `${api_host}/canvas/getversion/${id}`,
   fetchCanvas: (id: string) => `${api_host}/canvas/get/${id}`,
   fetchAgentAvatar: (id: string) => `${api_host}/canvas/getsse/${id}`,
+  uploadAgentFile: (id?: string) => `${api_host}/canvas/upload/${id}`,
 
   // mcp server
   listMcpServer: `${api_host}/mcp_server/list`,