Fix PCB API JSON serialization issue

啊鑫

2025-07-10 2c1d75c4e57092eea3c26b925ab76c9fd17de736

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### Example user template template
### Example user template
 
# IntelliJ project files
.idea
*.iml
out
gen
*/obj/*
.vs
MESApplication/obj/*/*
MESApplication/obj