feat: improve setup wizard UX and add real client configuration

1. Remove dependency mentions from package.json description
2. Only show dependency warnings when dependencies are actually missing
3. Add actual MCP client configuration functionality within the wizard:
   - Client selection dropdown
   - Individual client configuration
   - Claude Code registration/unregistration
   - Batch configuration for all clients
   - Manual setup instructions
   - Real configuration file writing

Users can now complete full setup including client configuration without leaving the wizard.

Author: Claude