fix:修复异步图像可能导致的panic异常

internal/handler/relay/sync_image.go

@@ -93,7 +93,15 @@ func HandleSyncImageSubmit(r *ghttp.Request, body []byte, rc *relay_handler.Task
 	}
 
 	// 5. 建 QUEUED 任务行（channel_id=0，dispatch 时绑定）
-	publicTaskID := generateSyncImagePublicID()
+	// 生成任务 ID 依赖 crypto/rand，失败时此处尚未建任务行、无法交给超时兜底网结算，
+	// 必须就地退掉上一步的预扣，避免冻结额被永久占用。
+	publicTaskID, err := generateSyncImagePublicID()
+	if err != nil {
+		_ = taskBillingProvider.SettleTaskFailed(ctx, rc.TenantID, rc.RequestID, preDeduct)
+		g.Log().Errorf(ctx, "sync_image: generate task ID failed, refunded pre-deduct: %v", err)
+		writeSyncImageError(w, http.StatusInternalServerError, "generate task ID failed")
+		return
+	}
 	now := time.Now()
 
 	// 从渠道类型推导实际的供应商平台（ali / gemini / volcengine / openai 等），用于任务日志展示。
@@ -258,12 +266,12 @@ func checkSyncImageIPWhitelist(whitelist, clientIP string) bool {
 	return false
 }
 
-func generateSyncImagePublicID() string {
+func generateSyncImagePublicID() (string, error) {
 	b := make([]byte, 16)
 	if _, err := crand.Read(b); err != nil {
-		panic("crypto/rand failed: " + err.Error())
+		return "", err
 	}
-	return "task_" + hex.EncodeToString(b)
+	return "task_" + hex.EncodeToString(b), nil
 }
 
 func writeSyncImageError(w http.ResponseWriter, statusCode int, message string) {

internal/handler/relay/sync_image_test.go

@@ -94,7 +94,10 @@ func TestCheckSyncImageIPWhitelist(t *testing.T) {
 }
 
 func TestGenerateSyncImagePublicID(t *testing.T) {
-	id := generateSyncImagePublicID()
+	id, err := generateSyncImagePublicID()
+	if err != nil {
+		t.Fatalf("generateSyncImagePublicID() error = %v", err)
+	}
 	if !strings.HasPrefix(id, "task_") {
 		t.Fatalf("id %q should have task_ prefix", id)
 	}
@@ -102,7 +105,11 @@ func TestGenerateSyncImagePublicID(t *testing.T) {
 		t.Fatalf("id %q length = %d, want %d", id, len(id), len("task_")+32)
 	}
 	// 唯一性（极小概率碰撞）
-	if generateSyncImagePublicID() == id {
+	id2, err := generateSyncImagePublicID()
+	if err != nil {
+		t.Fatalf("generateSyncImagePublicID() error = %v", err)
+	}
+	if id2 == id {
 		t.Fatal("two ids should differ")
 	}
 }