etherpad: switch default DB to sqlite + use canonical ether/etherpad repo refs

- ct/etherpad.sh + install/etherpad-install.sh: use ether/etherpad
  (canonical name; ether/etherpad-lite still redirects but the new
  name is preferred)
- install/etherpad-install.sh: switch dbType from dev-only "dirty"
  to sqlite at /var/lib/etherpad/etherpad.db on first config seed;
  matches the same default we land on across the snap, .deb, and
  Home Assistant add-on packagings
- json/etherpad.json: refresh note to reflect the sqlite default
  and document postgres/mysql as alternatives via dbType/dbSettings

ct/etherpad.sh

@@ -29,7 +29,7 @@ function update_script() {
     exit
   fi
 
-  if check_for_gh_release "etherpad-lite" "ether/etherpad-lite"; then
+  if check_for_gh_release "etherpad-lite" "ether/etherpad"; then
     msg_info "Stopping Service"
     systemctl stop etherpad
     msg_ok "Stopped Service"
@@ -39,7 +39,7 @@ function update_script() {
     [ -d /opt/etherpad-lite/var ] && cp -a /opt/etherpad-lite/var /opt/etherpad-var.bak
     msg_ok "Backed up Configuration"
 
-    CLEAN_INSTALL=1 fetch_and_deploy_gh_release "etherpad-lite" "ether/etherpad-lite" "tarball" "latest" "/opt/etherpad-lite"
+    CLEAN_INSTALL=1 fetch_and_deploy_gh_release "etherpad-lite" "ether/etherpad" "tarball" "latest" "/opt/etherpad-lite"
 
     msg_info "Rebuilding Etherpad"
     cd /opt/etherpad-lite

install/etherpad-install.sh

@@ -31,7 +31,7 @@ msg_info "Creating etherpad User"
 useradd --system --create-home --home-dir /var/lib/etherpad --shell /usr/sbin/nologin etherpad
 msg_ok "Created etherpad User"
 
-fetch_and_deploy_gh_release "etherpad-lite" "ether/etherpad-lite" "tarball" "latest" "/opt/etherpad-lite"
+fetch_and_deploy_gh_release "etherpad-lite" "ether/etherpad" "tarball" "latest" "/opt/etherpad-lite"
 
 msg_info "Building Etherpad"
 cd /opt/etherpad-lite
@@ -41,7 +41,18 @@ msg_ok "Built Etherpad"
 
 msg_info "Configuring Etherpad"
 cp /opt/etherpad-lite/settings.json.template /opt/etherpad-lite/settings.json
-sed -i 's#"ip": *"127.0.0.1"#"ip": "0.0.0.0"#' /opt/etherpad-lite/settings.json
+# Switch dbType from the upstream template's dev-only "dirty" default to
+# sqlite (ACID, single-file) backed by a file in the etherpad user's
+# state directory. Matches the same default across our snap, .deb, and
+# Home Assistant add-on packagings. Admins who need postgres or mysql
+# can edit settings.json and switch dbType + dbSettings; ueberdb
+# supports both backends via the same code path.
+install -d -o etherpad -g etherpad -m 0750 /var/lib/etherpad
+sed -i \
+  -e 's#"ip": *"127.0.0.1"#"ip": "0.0.0.0"#' \
+  -e 's#"dbType" *: *"dirty"#"dbType": "sqlite"#' \
+  -e 's#"filename" *: *"var/dirty.db"#"filename": "/var/lib/etherpad/etherpad.db"#' \
+  /opt/etherpad-lite/settings.json
 chown -R etherpad:etherpad /opt/etherpad-lite
 msg_ok "Configured Etherpad"
 

json/etherpad.json

@@ -33,7 +33,7 @@
   },
   "notes": [
     {
-      "text": "The default install uses the built-in DirtyDB store, intended for evaluation only. For production, edit /opt/etherpad-lite/settings.json and switch the 'dbType' to mysql or postgres.",
+      "text": "The default install uses an embedded sqlite database at /var/lib/etherpad/etherpad.db — ACID, zero-config, suitable for single-instance homelab use. To use postgres or mysql instead, edit /opt/etherpad-lite/settings.json and switch 'dbType' + 'dbSettings' (Etherpad's ueberdb abstraction supports both).",
       "type": "info"
     },
     {