Add Caddy reverse proxy configuration and Kopia backup documentation

- Create INFRASTRUCTURE-COMPLETE.md: Comprehensive infrastructure overview
  * Network architecture and DNS configuration
  * Storage architecture for Nextcloud (1.4TB warm storage via LVM)
  * Kopia backup setup with Backblaze B2 integration
  * Caddy reverse proxy configuration (CT 202)
  * Security configuration and capacity planning

- Add Caddy reverse proxy configurations:
  * caddy-kopia-integration.md: Integration steps for CT 202
  * caddy-kopia-reverse-proxy.md: Complete configuration reference
  * caddy/Caddyfile: Production-ready configuration
  * caddy/docker-compose.yml: Docker deployment spec

- Add Kopia backup documentation:
  * kopia-nextcloud-backblaze-setup.md: Complete Kopia setup guide
  * Backup strategy, retention policies, and restore procedures

- Update related documentation with consolidated references

Status: Infrastructure documented and ready for deployment

docs/setup/nextcloud-docker-compose-update.yml

@@ -3,7 +3,7 @@
 # This configuration pulls OpenCode config from centralized Gitea repository
 # instead of managing per-VM configuration files
 #
-# Updated for centralized config management via http://192.168.88.200:3000
+# Updated for centralized config management via http://192.168.88.27:3002
 
 version: '3.8'
 
@@ -40,7 +40,7 @@ services:
       mkdir -p /tmp/homelab-configs
 
       # Clone the central configs repo
-      if git clone http://192.168.88.200:3000/jgitta/homelab-configs.git /tmp/homelab-configs; then
+      if git clone http://192.168.88.27:3002/jgitta/homelab-configs.git /tmp/homelab-configs; then
         echo '✅ Configuration fetched successfully'
       else
         echo '⚠️  Could not fetch configs from Gitea, using defaults'