chore(abs): name the Audiobookshelf door audiobooks.franksdank.cloud

`abs.` was a three-letter abbreviation of the container; the library it serves is
/mnt/entropy/Audiobooks, and `audiobooks.` says what the door is. Renamed in one
commit on purpose: the pihole seam fails the suite if a Caddyfile vhost has no
addn-hosts record, so any split would leave a red commit, and the `abs` name was
never deployed at the IdP with this fix, so nothing has to keep answering it —
no alias, no redirect, no stale URI.

Moves together: the Caddyfile site block, its matcher (@abs -> @audiobooks), the
LAN record, ABS_EXTRA_BASES in authentik-audiobookshelf-sso.sh (that script
REPLACES the provider's redirect-URI list, so the old origin's callback leaves the
RP when it is next run), the homepage admin tile, the guard spec's GUARDED list and
leak marker, and the three vault pages that name the door. authentik's provider row
follows in the deploy window (external_host + name), which re-derives its
redirect_uris through scripts/authentik-proxy-provider-defaults.sh; the Application
row keeps its own name, "Audiobookshelf Guard" — it names the app, not the vhost.

serverAppConfigs-docs/Dankserver/Audiobookshelf.md

@@ -17,7 +17,7 @@ server — it shares nothing with [[Plex]] or [[Jellyfin]] and owns no files on
 array.
 
 **Host:** Dankserver — **Unit:** `audiobookshelf.service` (rootless Quadlet, user manager) —
-**Doors:** LAN `http://192.168.0.235:8000/audiobookshelf` (direct, what the phone app uses) and guarded `https://abs.franksdank.cloud/audiobookshelf/`.
+**Doors:** LAN `http://192.168.0.235:8000/audiobookshelf` (direct, what the phone app uses) and guarded `https://audiobooks.franksdank.cloud/audiobookshelf/`.
 
 ## Shape
 
@@ -98,7 +98,7 @@ the local form, and the phone app offers SSO on its server-address screen. The l
 | The ABS half: issuer, the four IdP URLs, claim, auto-register | `scripts/audiobookshelf-init.sh`, armed automatically when that secret exists in the credential file |
 | Role at first SSO sign-in | the `abs_groups` claim: `audiobookshelf_admins` → `admin`, `audiobookshelf_users` → `user`, in neither → denied (fail closed) |
 | Admin group members | `akadmin` (the operator's own authentik admin account — sign in as it and the claim grants site admin) and `qa-e2e-admin` (the identity the deploy gate signs in as, so the script re-adds it every run; drop it and the gate fails, not a phone) |
-| The guard in front of the vhost | proxy provider `abs-proxy` (external_host `https://abs.franksdank.cloud/`, internal_host `http://caddy:8017`) + application "Audiobookshelf Guard", claimed by the embedded outpost — the ak-shell recipe in [[Caddy]] *Guard a new vhost* creates it; without that row the chain answers authentik's error page, not the login |
+| The guard in front of the vhost | proxy provider `audiobooks-proxy` (external_host `https://audiobooks.franksdank.cloud/`, internal_host `http://caddy:8017`) + application "Audiobookshelf Guard" (its own name tracks the app, not the vhost), claimed by the embedded outpost — the ak-shell recipe in [[Caddy]] *Guard a new vhost* creates it; without that row the chain answers authentik's error page, not the login |
 
 The IdP saying yes is not the same as being allowed in: with `authOpenIDAutoRegister` on,
 a first sign-in creates the account, and the claim alone decides the type. A user in
@@ -144,7 +144,7 @@ Both halves — authentik's provider row and ABS's settings — are asserted end
   `callback` against the origin it believes it is served from — `getRequestOrigin()` is
   `x-forwarded-proto://Host` (`server/utils/requestUtils.js`, read in the pinned digest
   2026-11-03) — so behind a TLS edge that reaches the container over plain http it computes
-  `http://abs.franksdank.cloud` and answers its own https callback with a 400 "Invalid callback
+  `http://audiobooks.franksdank.cloud` and answers its own https callback with a 400 "Invalid callback
   URL - must be same-origin" before the IdP is ever contacted. The Caddy `:8017` route pins
   `header_up X-Forwarded-Proto https` for exactly that reason ([[Caddy]] *Guard a new vhost*);
   the LAN door needs nothing, because there browser and server agree on `http`.
@@ -197,7 +197,7 @@ Both halves — authentik's provider row and ABS's settings — are asserted end
   service across a reboot ([[Quadlet Lifecycle]]).
 - **Two doors, one app.** `http://192.168.0.235:8000/audiobookshelf` is the raw
   LAN address — plain HTTP, nothing in front, what the phone app is configured
-  with; `https://abs.franksdank.cloud/audiobookshelf/` is the guarded vhost
+  with; `https://audiobooks.franksdank.cloud/audiobookshelf/` is the guarded vhost
   (Caddy → Anubis → the Authentik outpost → Caddy `:8017` → this container),
   the house chain for browser traffic — [[Caddy]] *Guard a new vhost*. That
   chain serves browsers only: the phone app is a non-browser client and solves

serverAppConfigs-docs/Infrastructure/Authentik Outpost Reference.md

@@ -87,7 +87,7 @@ Three provisioning rules, each verified live by an outage or a dead login:
    `_get_callback_url`) and `grant_types` is `[]`. Both kill the guard before any credential,
    in this order: authentik renders its own **"Redirect URI Error"** page, and once the URIs
    are filled by hand the next wall is a bodiless **HTTP 400** out of `/application/o/authorize/`
-   (both measured on `abs-proxy`, 2026-11-03). Census and repair in one idempotent pass, all
+   (both measured on the Audiobookshelf guard provider, 2026-11-03). Census and repair in one idempotent pass, all
    providers at once: `scripts/authentik-proxy-provider-defaults.sh`; `--check` prints the
    census and exits 1 on drift, and a provider that already matches is left alone.
 

serverAppConfigs-docs/Infrastructure/Caddy.md

@@ -107,7 +107,7 @@ authentik's error page instead of the app.
    from authentik.providers.proxy.models import ProxyProvider
    from authentik.core.models import Application
    from authentik.outposts.models import Outpost
-   NAME, EXT = "abs", "https://abs.franksdank.cloud/"
+   NAME, EXT = "audiobooks", "https://audiobooks.franksdank.cloud/"
    pp = ProxyProvider.objects.filter(name=f"{NAME}-proxy").first()
    if pp is None:
        pp = ProxyProvider.objects.create(name=f"{NAME}-proxy", external_host=EXT,