Keep backend runs alive on client disconnect

frontend/app/app/api/chat/route.ts

@@ -110,10 +110,6 @@ export async function POST(req: Request) {
 			writer.write({ type: "start-step" });
 
 			try {
-				const cancelOnAbort = () => {
-					void cancelClawRun(account.id, sessionId, streamState.runId);
-				};
-				req.signal.addEventListener("abort", cancelOnAbort, { once: true });
 				const startedAt = Date.now();
 				writer.write({ type: "reasoning-start", id: "reasoning-1" });
 				writer.write({
@@ -129,9 +125,7 @@ export async function POST(req: Request) {
 					resumeId,
 					writer,
 					streamState,
-					req.signal,
 				);
-				req.signal.removeEventListener("abort", cancelOnAbort);
 				const elapsedMs = payload.elapsed_ms ?? Date.now() - startedAt;
 				const text = formatClawResponse(payload);
 
@@ -351,13 +345,11 @@ async function callClawBackendStream(
 	resumeSessionId?: string,
 	writer?: UIMessageStreamWriter<UIMessage>,
 	streamState?: StreamState,
-	signal?: AbortSignal,
 ): Promise<ClawChatResponse> {
 	try {
 		const response = await fetch(`${CLAW_API_URL}/api/chat/stream`, {
 			method: "POST",
 			headers: { "content-type": "application/json" },
-			signal,
 			body: JSON.stringify({
 				prompt,
 				runtime_context: runtimeContext,
@@ -390,26 +382,6 @@ async function callClawBackendStream(
 	}
 }
 
-async function cancelClawRun(
-	accountId: string,
-	sessionId: string,
-	runId?: string,
-) {
-	try {
-		await fetch(`${CLAW_API_URL}/api/runs/cancel`, {
-			method: "POST",
-			headers: { "content-type": "application/json" },
-			body: JSON.stringify({
-				account_id: accountId,
-				session_id: sessionId,
-				...(runId ? { run_id: runId } : {}),
-			}),
-		});
-	} catch {
-		// 浏览器关闭或网络中断时，取消请求本身也可能失败；后端流断开仍会结束本次响应。
-	}
-}
-
 async function consumeClawStream(
 	body: ReadableStream<Uint8Array>,
 	writer?: UIMessageStreamWriter<UIMessage>,