acme mode fully replaced the internal-CA path (which required installing a private
CA on every device — the exact pain, esp. on Android, that acme avoids). Remove
`internal` entirely and simplify how services declare host routes.
- Generator (caddyfile.py): drop the `tls internal` branch — modes are now
`off` | `acme`. In acme mode the published subdomain is the **first DNS label**
of `proxy.caddy.host` (a bare `claw`, or a legacy `claw.civil.lan`, both →
`claw.<domain>`), so services stay domain-agnostic and the declared value is
authoritative again (no more silent service-name override). Shared
`_host_matcher_block` reused by off-mode and the acme wildcard site.
- castle-api: delete `GET /gateway/ca.crt`, `_gateway_ca_pem`, `_ca_fingerprint`
and the now-unused imports; drop `ca_fingerprint` from `GatewayInfo` (keep
`tls`).
- Dashboard: remove the CA-cert download button + unused imports; drop
`ca_fingerprint` from the `GatewayInfo` type.
- Tests: replace TestCaddyfileTlsInternal with an off-mode class (keeps the
runner-agnostic host-route coverage); acme tests assert first-label derivation
incl. label-wins-over-service-name; drop the castle-api CA-endpoint test.
- Docs: registry.md + dns-and-tls.md — two-mode tables (off|acme), remove the
internal sections/CA-download, document the bare-label host convention; note a
domain-less node stays on `off`.
Paul Payne
a022a136fe