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_export.go

@@ -11,8 +11,8 @@ import (
 	"time"
 	"unicode"
 
-	"infinite-canvas/backend/internal/model"
-	"infinite-canvas/backend/internal/repository"
+	"yingce/backend/internal/model"
+	"yingce/backend/internal/repository"
 )
 
 const paymentExportLimit = 10_000