Add task API (#14393)

### What problem does this PR solve?

Add task API

### Type of change

- [x] Refactor

web/src/utils/api.ts

@@ -196,7 +196,7 @@ export default {
     `${restAPIv1}/agents/${agentId}/components/${componentId}/debug`,
   trace: (agentId: string, messageId: string) =>
     `${restAPIv1}/agents/${agentId}/logs/${messageId}`,
-  cancelCanvas: (taskId: string) => `${webAPI}/canvas/cancel/${taskId}`, // cancel conversation
+  cancelCanvas: (taskId: string) => `${restAPIv1}/tasks/${taskId}/cancel`,
   // agent
   inputForm: (agentId: string, componentId: string) =>
     `${restAPIv1}/agents/${agentId}/components/${componentId}/input-form`,
@@ -215,7 +215,7 @@ export default {
   fetchExternalAgentInputs: (canvasId: string) =>
     `${restAPIv1}/agentbots/${canvasId}/inputs`,
   prompt: `${restAPIv1}/agents/prompts`,
-  cancelDataflow: (id: string) => `${webAPI}/canvas/cancel/${id}`,
+  cancelDataflow: (id: string) => `${restAPIv1}/tasks/${id}/cancel`,
   downloadFile: `${restAPIv1}/agents/download`,
   testWebhook: (id: string) => `${restAPIv1}/agents/${id}/webhook/test`,
   fetchWebhookTrace: (id: string) => `${restAPIv1}/agents/${id}/webhook/logs`,