Add garage-webui: browse Garage's buckets/objects like Backblaze's console

User's actual question: Backblaze B2's web console lets them browse a
bucket as folders/files; Garage has no equivalent by default, so after
switching an additional backup mirror from Backblaze-only to also
target local Garage, they had no way to visually confirm data landed
there the way they could on Backblaze. "S3 storage is opaque, you
can't browse it" was true of Garage's *own* CLI, but wrong as a
blanket statement — Backblaze's browsability comes from a client (its
web console) layered on top of the same kind of object storage, and
Garage has an actively-maintained equivalent (khairul169/garage-webui,
1.1k stars, "integrated objects/bucket browser") that gives the same
experience against Garage's S3 API.

services/garage-webui.sh (new): standard service-template Docker
service. Requires an existing services/garage.sh install (checks for
$DOCKER_DIR/garage/.env, errors with instructions if missing — this
is a browser for an existing instance, not a replacement). Reaches
Garage over host.docker.internal (both containers' ports are already
published to the host — simpler and more robust than trying to join
garage's own Compose-project-scoped default network by name). Has its
own login (AUTH_USER_PASS, bcrypt via a throwaway `docker run --rm
httpd:alpine htpasswd` — same $ -> $$ escaping services/wg-easy.sh
already uses for its own bcrypt PASSWORD_HASH, verified here against a
real docker compose config run: unescaped, Compose tries to interpolate
$2y$05... as variable references and silently corrupts the value with
a "not set" warning; escaped, it passes through intact with no
warning), so it doesn't need Authelia gating by default.

Prerequisite fix in services/garage.sh: its admin API (bucket/key
management, object listing — the thing garage-webui talks to) has
been running with zero authentication since this service was first
built, because admin_token was never set in garage.toml. Nothing in
this repo called that API before now, so it went unnoticed; adding a
real consumer is what surfaced it. Fixed: generate admin_token
(openssl rand -base64 32) alongside the existing rpc_secret, persist
GARAGE_ADMIN_TOKEN/GARAGE_ADMIN_PORT to .env for garage-webui to read
locally (never sent over SSH, unlike the S3 credentials backup.sh
reads remotely). Update mode backfills admin_token into an existing
garage.toml (+ restarts just the garage container to apply it) for
anyone who installed before this change, same backfill-not-break
approach as the GARAGE_S3_API_PORT fix from the previous commit.

Verified: bash -n on both files; docker compose config against real
Docker Compose for both the primary garage.toml/.env generation (with
the new admin_token/GARAGE_ADMIN_PORT fields) and the new
garage-webui docker-compose.yml; the bcrypt-escaping behavior
specifically (proved via a minimal repro that unescaped $ corrupts
the value with a warning, escaped does not); the admin_token/
GARAGE_ADMIN_PORT Update-mode backfill logic against old- and
new-style .env/garage.toml fixtures, including idempotency (running
it twice adds nothing a second time); and the credential-parsing
regexes in garage-webui.sh against both a complete .env fixture and
an old one missing the new fields (confirms the "run garage's Update
first" error path actually triggers rather than proceeding with
blanks).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H4k6J1qXXyYxhGEgnJaMvn

README.md

@@ -186,7 +186,7 @@ a ready-to-copy Caddy config snippet to `~/docker/caddy-snippets/`.
 |-------|---------|
 | `base` | `net-tools`, `ncdu`, `git`, `curl`, `wget`, `htop`, `tree`, `zip`/`unzip`, `ca-certificates`, `gnupg`, `jq`, `rsync`; `glow` (terminal markdown reader, Charm apt repo); Docker CE + Compose plugin; `openssh-server` with GitHub/Launchpad SSH key import, optional password-auth lockdown, and SSH Host aliases; optional NetBird overlay network |
 | `homelab` | `caddy`, `crowdsec`, `authelia`, `homeassistant`, `asterisk` (own dedicated coturn for TURN/STUN — see `mattermost` below for the other coturn-owning service), `pstn-trunk`, `sms-inbound`, `security-dashboard`, `sunshine`, `vpn-data-mount` (mount existing SMB shares from a NetBird-connected home box — SSH trust bootstrap, then read-only discovery of shares already configured there; never writes to the home box's Samba config; repeatable, pick from any number of a home box's shares in one pass; optional per-share [gocryptfs decrypt layer](#client-side-encryption-for-vpn-data-mount) so the VPS only ever handles ciphertext) |
-| `utilities` | `actualbudget`, `ai-gpu`, `ai-stack`, `archivebox`, `beszel` (lightweight server + Docker monitoring — CPU/RAM/disk/network, auto-discovers running containers via the Docker socket; complements Gatus rather than replacing it — Gatus is a black-box HTTP check, Beszel is white-box host/process monitoring), `beszel-agent` (agent-only Beszel install for a remote/homelab box reporting to a hub elsewhere — connects outbound over HTTPS, no VPN/port-forwarding/FQDN needed on that box), `changedetection`, `ddclient`, `filebrowser`, `fmd`, `garage` (self-hosted S3-compatible object storage, single node — MinIO CE's actively-maintained replacement), `gatus`, `homebox`, `iopaint`, `joplin`, `koha`, `magicmirror`, `mail-archiver`, `mattermost`, `mealie`, `meshcentral`, `n8n`, `nextcloud`, `ntfy`, `onlyoffice`, `paintplus`, `pihole` (standalone DNS ad/tracker blocking — not wired into any VPN's DNS push), `portainer`, `rustdesk`, `stirling-pdf`, `syncthing`, `traccar`, `unifi`, `uptimekuma`, `vaultwarden`, `watchyourlan`, `watchtower`, `wg-easy`, `wordpress` (multi-site, dedicated MariaDB per site — blogs, business sites, e-commerce via WooCommerce) |
+| `utilities` | `actualbudget`, `ai-gpu`, `ai-stack`, `archivebox`, `beszel` (lightweight server + Docker monitoring — CPU/RAM/disk/network, auto-discovers running containers via the Docker socket; complements Gatus rather than replacing it — Gatus is a black-box HTTP check, Beszel is white-box host/process monitoring), `beszel-agent` (agent-only Beszel install for a remote/homelab box reporting to a hub elsewhere — connects outbound over HTTPS, no VPN/port-forwarding/FQDN needed on that box), `changedetection`, `ddclient`, `filebrowser`, `fmd`, `garage` (self-hosted S3-compatible object storage, single node — MinIO CE's actively-maintained replacement), `garage-webui` (browser-based bucket/object browser for an existing `garage` install — folders/files view, the same kind of thing Backblaze's own web console gives you), `gatus`, `homebox`, `iopaint`, `joplin`, `koha`, `magicmirror`, `mail-archiver`, `mattermost`, `mealie`, `meshcentral`, `n8n`, `nextcloud`, `ntfy`, `onlyoffice`, `paintplus`, `pihole` (standalone DNS ad/tracker blocking — not wired into any VPN's DNS push), `portainer`, `rustdesk`, `stirling-pdf`, `syncthing`, `traccar`, `unifi`, `uptimekuma`, `vaultwarden`, `watchyourlan`, `watchtower`, `wg-easy`, `wordpress` (multi-site, dedicated MariaDB per site — blogs, business sites, e-commerce via WooCommerce) |
 | `media` | `arm`, `audiobookshelf`, `calibre-web`, `emby`, `immich`, `jellyfin`, `lyrion` |
 | `cameras` | `frigate`, `frigate-audio`, `frigate-notify`, `sky-cam` |
 | `gaming` | `drum-rhythm-game`, `js99er`, `kyber-launcher`, `kyber-server`, `minecraft`, `wolf`, `wolf-pair` |