refactor(*): 代码质量 - 优化前后端实现并完善协议与画布验证

backend/internal/app/payment_runtime_cache_test.go

@@ -8,7 +8,7 @@ import (
 	"runtime"
 	"testing"
 
-	"infinite-canvas/backend/internal/protocol"
+	"yingce/backend/internal/protocol"
 )
 
 func TestPaymentRuntimeCacheUsesCompletePackageDigest(t *testing.T) {