Homepage: give the user page its own login (dankuser)

The homepage user page + shared data now use a dedicated CADDY_HOMEPAGE_HASH
(username dankuser), separate from the shared family password (CADDY_BASICAUTH_HASH,
username dank, still used by the other vhosts) and the operator password
(CADDY_ADMIN_HASH, username frank, the /admin/ page). This lets the homepage be
re-logged independently without touching the other sites. deploy.sh renders the
new placeholder; the .env.example documents all three hashes.

dankclaw/.env.example

@@ -25,9 +25,16 @@ GRAFANA_ADMIN_USER=admin
 GRAFANA_ADMIN_PASSWORD=changeme
 
 # Caddy (the homelab's single reverse proxy, on this host)
-# bcrypt hash of the homepage/protected-vhost password (caddy hash-password).
-# deploy.sh renders it into /home/dank/Containers/caddy/Caddyfile.
+# bcrypt hashes (caddy hash-password). deploy.sh renders them into
+# /home/dank/Containers/caddy/Caddyfile.
+# CADDY_BASICAUTH_HASH: the shared family password (the other vhosts: gitea,
+#   grafana, search, ...). Username: dank.
 CADDY_BASICAUTH_HASH=changeme
+# CADDY_ADMIN_HASH: the operator-only password (the homepage /admin/ page).
+#   Username: frank.
+CADDY_ADMIN_HASH=changeme
+# CADDY_HOMEPAGE_HASH: the homepage user-page password. Username: dankuser.
+CADDY_HOMEPAGE_HASH=changeme
 
 # Hermes -> Signal (signal-cli daemon on the host, port 8080)
 # E.164 number of the linked Signal account (your primary number, for Note-to-Self).