Add initial install_station Python package structure

- Add install_station package with __init__.py and core modules
  - Include boot_manager.py for boot loader configuration (BootManager class with singleton pattern)
  - Add common.py with password strength validation utilities and ZFS dataset definitions
  - Add custom.py with Partitions class for disk partitioning management (1010 lines)
  - Establish foundation for GTK+ based GhostBSD installer application

  Modules added:
  - boot_manager: UEFI/BIOS boot manager selection with rEFInd and FreeBSD options
  - common: Password validation functions and deprecated decorator utility
  - custom: Comprehensive partition management with GTK+ interface

.gitignore

@@ -105,4 +105,5 @@ venv.bak/
 
 # Editor directories and files
 .vscode/
-.idea/.idea
+.idea
+CLAUDE.md