feat(caddy): integrate Bunny.net DNS and dynamic IP support

- Replace Bazarr with NZBGet in Caddyfile routes
- Add global DNS provider configuration for ACME DNS-01 challenges
- Implement dynamic DNS updater with Bunny.net provider
- Add comprehensive security headers and authentication
- Update documentation with new requirements and setup instructions
- Add .env.example, Dockerfile, cron jobs, and scripts
- Modify compose.yml to use local build and add environment variables

BREAKING CHANGE: Requires Bunny.net API key and updated Caddyfile configuration

Dockerfile

@@ -0,0 +1,15 @@
+# Custom Caddy Dockerfile with Bunny DNS and Dynamic DNS modules
+# Based on official Caddy Alpine image
+FROM caddy:2.7.6-alpine
+
+# Install xcaddy for custom builds
+RUN apk add --no-cache xcaddy
+
+# Build Caddy with required modules
+RUN xcaddy build \
+    --output /usr/bin/caddy \
+    --with github.com/caddy-dns/bunny \
+    --with github.com/mholt/caddy-dynamicdns
+
+# Verify modules are loaded
+RUN caddy list-modules | grep -E "dns.providers.bunny|dynamic_dns" && echo "Modules loaded successfully" || exit 1