fix(webtrees): initialize database schema before admin user creation

PR #14818 replaced the setup wizard curl with CLI commands but omitted
the schema migration step, causing fresh installs to fail when creating
the admin user. Trigger schema init via HTTP after config-ini.

Fixes #15828

install/webtrees-install.sh

@@ -47,6 +47,8 @@ msg_ok "Configured Caddy"
 
 msg_info "Automating Webtrees Setup"
 cd /opt/webtrees
+mkdir -p /opt/webtrees/data
+chown -R www-data:www-data /opt/webtrees/data
 WT_ADMIN_PASS=$(openssl rand -base64 18 | tr -dc 'a-zA-Z0-9' | head -c15)
 $STD sudo -u www-data php /opt/webtrees/index.php config-ini \
   --dbhost=127.0.0.1 \
@@ -56,6 +58,15 @@ $STD sudo -u www-data php /opt/webtrees/index.php config-ini \
   --dbname=webtrees \
   --tblpfx=wt_ \
   --base-url="http://${LOCAL_IP}"
+msg_info "Initializing Webtrees database schema"
+for i in {1..15}; do
+  if curl -sf "http://127.0.0.1/" >/dev/null 2>&1; then
+    break
+  fi
+  sleep 2
+done
+$STD mariadb -u webtrees -p"${MARIADB_DB_PASS}" -h 127.0.0.1 webtrees -e "SHOW TABLES LIKE 'wt_user';" | grep -q wt_user
+msg_ok "Initialized Webtrees database schema"
 $STD sudo -u www-data php /opt/webtrees/index.php user Admin \
   --create \
   --real-name="Administrator" \