refactor(*): 代码质量 - 优化前后端实现并完善协议与画布验证

backend/internal/database/migrations_video_token_test.go

@@ -3,7 +3,7 @@ package database
 import (
 	"testing"
 
-	"infinite-canvas/backend/internal/model"
+	"yingce/backend/internal/model"
 )
 
 func TestMigrateSchemaV25PreservesHistoricalBillingOrders(t *testing.T) {