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

compose.yml

@@ -1,6 +1,6 @@
 services:
   caddy:
-    image: caddy:2.6.4
+    build: .
     container_name: caddy
     restart: unless-stopped
     ports:
@@ -11,6 +11,9 @@ services:
       - ./conf:/etc/caddy
       - caddy_data:/data
       - caddy_config:/config
+    environment:
+      - BUNNY_API_KEY=${BUNNY_API_KEY}
+      - CADDY_EMAIL=${CADDY_EMAIL}
 
 volumes:
   caddy_data: