Update internal/jupyter/service_manager.go to use centralized PathRegistry:
Changes:
- Import config package for PathRegistry access
- Update stateDir() to use config.FromEnv().JupyterStateDir()
- Update workspaceBaseDir() to use config.FromEnv().ActiveDataDir()
- Update trashBaseDir() to use config.FromEnv().JupyterStateDir()
- Update NewServiceManager() to use PathRegistry for workspace metadata file
- Update loadServices() to use PathRegistry for services file path
- Update saveServices() to use PathRegistry with EnsureDir()
- Rename parameter 'config' to 'svcConfig' to avoid shadowing import
Benefits:
- Consistent path management across codebase
- Centralized directory creation with EnsureDir()
- Environment variable override still supported (backward compatible)
- Proper error handling for directory creation failures
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