fix: [#412] include UDP tracker domains in provision output and DNS reminder

[josecelano]

Summary

Fixes #412 — UDP tracker domains were missing from the provision command output domains array and the DNS setup reminder.

Root Cause

ProvisionDetailsData and DnsReminderView::extract_all_domains both called ServiceInfo::tls_domain_names(), which only returns domains for TLS-enabled HTTP services. UDP trackers are not TLS services, so their domains were never included.

Changes

src/application/command_handlers/show/info/tracker.rs

• Added all_domain_names() -> Vec<&str> to ServiceInfo: returns TLS service domains plus UDP tracker domains (when a domain name is configured). IP-only UDP trackers (no domain field) are excluded.
• Added private helper extract_host_from_udp_url().
• tls_domain_names() is unchanged — the HTTPS-specific hint still uses it correctly.
• Added two unit tests:
  • it_should_return_all_domain_names_including_udp
  • it_should_exclude_udp_trackers_without_domain_from_all_domain_names

src/presentation/cli/views/commands/provision/view_data/provision_details.rs

• From<&Environment<Provisioned>>: replaced tls_domain_names() call with all_domain_names().

src/presentation/cli/views/commands/provision/view_data/dns_reminder.rs

• extract_all_domains(): replaced tls_domain_names() call with all_domain_names().
• Added unit test it_should_include_udp_tracker_domains_in_extract_all_domains.

Acceptance Criteria

• provision output domains array includes UDP tracker domain names when configured
• provision output domains array does not include IP-only UDP trackers
• DNS setup reminder also includes UDP tracker domains
• tls_domain_names() is unchanged
• Unit tests pass for both UDP-with-domain and UDP-without-domain cases
• Pre-commit checks pass (./scripts/pre-commit.sh)

Manual E2E Verification

Provisioned a local LXD VM with two UDP trackers each having a domain configured. The provision JSON output returned:

"domains": [
  "udp1.torrust-tracker-demo.com",
  "udp2.torrust-tracker-demo.com"
]

Before the fix this array was empty (no HTTP/TLS services in the test config).

[josecelano]

ACK bca1a2a