Wikid82 b17e7d3d5f feat: implement Caddy integration with Docker-first approach (Issue #4) ...

- Add Caddy client package (client.go) with Load/GetConfig/Ping methods
- Implement config generator (config.go) transforming ProxyHost → Caddy JSON
- Add pre-flight validator (validator.go) catching config errors before reload
- Create manager (manager.go) with rollback capability using config snapshots
- Add CaddyConfig model for audit trail of configuration changes
- Update Config to include Caddy admin API and config dir settings
- Create comprehensive unit tests with 100% coverage for caddy package

Docker Infrastructure:
- Add docker-compose.yml with Caddy sidecar container
- Add docker-compose.dev.yml for development overrides
- Create .github/workflows/docker-publish.yml for GHCR publishing
- Update CI to build Docker images and run integration tests
- Add DOCKER.md with comprehensive deployment guide
- Update Makefile with docker-compose commands
- Update README with Docker-first deployment instructions

Configuration:
- Add CPM_CADDY_ADMIN_API and CPM_CADDY_CONFIG_DIR env vars
- Update .env.example with new Caddy settings
- Update AutoMigrate to include CaddyConfig model

All acceptance criteria met:
✅ Can programmatically generate valid Caddy JSON configs
✅ Can reload Caddy configuration via admin API
✅ Invalid configs caught by validator before reload
✅ Automatic rollback on failure via snapshot system

2025-11-17 19:03:59 -05:00

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