feat: add ByteStash service for code snippet management

- Add ByteStash Docker service configuration and deployment
- Configure subdomain routing through Caddy
- Add DNS record for ByteStash subdomain
- Update development service category to include ByteStash

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

group_vars/all/domains.yml

@@ -29,6 +29,7 @@ subdomains:
   appriseapi: "appriseapi.{{ primary_domain }}"
   dockge: "dockge.{{ primary_domain }}"
   code: "code.{{ primary_domain }}"  # Code Server
+  bytestash: "snippets.{{ primary_domain }}"  # ByteStash code snippets
   gotify: "gotify.{{ primary_domain }}"  # Gotify notifications
   gotify_assistant: "gotify-assistant.{{ primary_domain }}"  # iGotify iOS assistant