Moved essential aios components to build.zsh (base layer):
- sudoers configuration (wheel group permissions)
- aigpt install (aios core package)
- aibot install (aios core package) - renamed from 'ai' to 'aibot'
Updated module responsibilities:
- build.zsh: Arch base + aios core packages (required)
- setup-user.sh: User customization only
- setup-claude.sh: Claude MCP configuration only
Benefits:
- Clear separation: base vs customization
- aigpt/aibot always included (core aios functionality)
- Modules can be optionally skipped for customization
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