Configure Traefik for public-facing access with frostlabs.me domains

- Fixed certificatesResolvers configuration in static.yml (moved out of tls section)
- Added DNS resolvers to Cloudflare ACME challenge configuration
- Added persistent volume mount for Let's Encrypt certificates
- Updated Outline service labels to use flow.frostlabs.me with proper cert resolver
- Updated Authentik service labels to use auth.frostlabs.me with proper cert resolver
- Added security headers and rate limiting middlewares to dynamic.yml
- Added example templates for public-facing service configuration

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

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

stacks/core/traefik/stack.yml

@@ -10,9 +10,9 @@ services:
     - CF_DNS_API_TOKEN_FILE=/run/secrets/cloudflare_api_token
     volumes:
     - /var/run/docker.sock:/var/run/docker.sock:ro
-    #
     - /home/doc/projects/swarm/conf/traefik-conf/static.yml:/etc/traefik/traefik.yml:ro
     - /home/doc/projects/swarm/conf/traefik-conf/dynamic.yml:/etc/traefik/dynamic/dynamic.yml:rw
+    - /home/doc/projects/swarm-data/appdata/traefik/certificates:/certificates
     secrets:
     - cloudflare_api_token
     networks: