✅ Enable multiple location selection for settings and hooks

- Settings and hooks now support checkbox selection for multiple installation locations
- Users can install the same component in multiple environments simultaneously:
  - 🏠 User Settings (~/.claude/settings.json) - Global
  - 📁 Project Settings (.claude/settings.json) - Team shared
  - ⚙️ Local Settings (.claude/settings.local.json) - Personal
  - 🏢 Enterprise Settings - System-wide (requires admin)
- Interactive prompts show checkbox interface with validation
- Each location is processed independently with conflict detection
- Progress messages show installation status for each location
- Tracking includes installation_location for analytics
- Graceful error handling - failed locations don't stop others
- Summary message shows total installations completed

Example: Install allow-npm-commands in both user and project settings
for global availability plus team sharing.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: davila7