fix(weknora): drop 120s client total timeout so long agent streams are not cut

The weknora HTTP client used a hardcoded 120s total-duration timeout, which
kills any smart-reasoning agent stream that legitimately runs longer (22 tool
rounds measured in prod) and the failure branch then overwrote the already
streamed card with the error text. Pass 0 and keep Go's default (no timeout).

cmd/dobotai/main.go

@@ -71,7 +71,10 @@ func main() {
 	if strings.TrimSpace(settingsRuntime.clientID) == "" || strings.TrimSpace(settingsRuntime.secret) == "" {
 		log.Fatal("DingTalk credentials are required; configure DINGTALK_CLIENT_ID and DINGTALK_CLIENT_SECRET in the protected runtime environment")
 	}
-	client, err := weknora.NewClient(os.Getenv("WEKNORA_BASE_URL"), os.Getenv("WEKNORA_API_KEY"), 120*time.Second)
+	// 0 = no client-side total timeout. WeKnora's smart-reasoning agent can run
+	// 20+ tool rounds and stream far longer than 120s; the total-time cap cut the
+	// SSE mid-answer and the failure branch overwrote the streamed card.
+	client, err := weknora.NewClient(os.Getenv("WEKNORA_BASE_URL"), os.Getenv("WEKNORA_API_KEY"), 0)
 	if err != nil {
 		log.Fatal(err)
 	}

internal/weknora/client.go

@@ -86,9 +86,8 @@ func NewClient(baseURL, apiKey string, timeout time.Duration) (*Client, error) {
 	if strings.TrimSpace(apiKey) == "" {
 		return nil, errors.New("WEKNORA_API_KEY is required")
 	}
-	if timeout <= 0 {
-		timeout = 120 * time.Second
-	}
+	// timeout <= 0 keeps Go's default: no client-side total timeout on the HTTP
+	// client, so long-lived agent SSE streams are never cut by a duration cap.
 	return &Client{baseURL: parsed.String(), apiKey: apiKey, http: &http.Client{Timeout: timeout}}, nil
 }