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

.env.example

@@ -0,0 +1,8 @@
+# .env.example - Example environment variables for Caddy Bunny
+# Copy this file to .env and fill in your actual values
+
+# Bunny.net API Key (required for DNS management)
+BUNNY_API_KEY=your_bunny_api_key_here
+
+# Email for Let's Encrypt account (required for TLS certificates)
+CADDY_EMAIL=your_email@example.com