Commands now show as 'wh create', 'wh staff add', 'wh set relaymode'
instead of 'wh-create', 'wh-staff add', 'wh-set relaymode'.
- Added commands/_base.py with root 'wh' group and all 20 subgroup stubs
- All 13 command mixins inherit from WormholeBase
- Decorators changed: @commands.hybrid_command(name='wh-X') → @WormholeBase.wh.command(name='X')
- Subgroup commands: @wh_X.command() → @WormholeBase.wh_X.command()
- Removed duplicate 'wh' group from core.py (now in _base.py)
- Fixed alias: 'wh-color' → 'color' for colour command
