feat: implement file-based persistence service

wanshenmean

2026-03-13 0b3d9467bfd081f607c7b17642e6c017aa32678d

 .gitignore

@@ -1,8 +1,12 @@
# Build and Object Folders  
bin/  
obj/  
  
# Nuget packages directory  
# Build and Object Folders
bin/
obj/

# Git worktrees (isolated workspaces)
.worktrees/
worktrees/

# Nuget packages directory
packages/  
  
## Ignore Visual Studio temporary files, build results, and