Add Caddy reverse proxy support to HOPS

### New Features
- Added Caddy reverse proxy as a service option
- Proper Docker container configuration with ports 80, 443, 2019
- Health check monitoring via Caddy admin API
- Volume mounts for Caddyfile, site content, and data persistence
- Integration with existing service selection and categorization

### Configuration Scope
- HOPS provides: Container setup, volume mounts, networking, health checks
- User provides: Caddyfile configuration, routing rules, SSL settings
- Clear documentation about configuration responsibilities
- Example Caddyfile provided in README

### Documentation Updates
- Updated README.md with Caddy service listing and configuration guide
- Updated CLAUDE.md with Caddy in supported services
- Added comprehensive configuration scope documentation
- Updated version references to 3.2.0

### Technical Implementation
- Added generate_caddy() function to services file
- Integrated Caddy into service selection switch
- Added port mapping for conflict detection (80, 443, 2019)
- Categorized under proxy & security services
- Added to available services listing

This addition provides users with another reverse proxy option while
maintaining HOPS' philosophy of providing infrastructure while allowing
users to maintain control over their specific configuration needs.

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

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

lib/system.sh

@@ -2,7 +2,7 @@
 
 # HOPS - System Validation Functions
 # Functions for system checks, OS detection, and requirements validation
-# Version: 3.1.0-beta
+# Version: 3.2.0
 
 # Source common functions
 LIB_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"