fix: keep setup database config empty and isolate Baota mode

deploy/install.sh

@@ -586,9 +586,11 @@ configure_database() {
   if [ "$SETUP_WIZARD" = true ]; then
     [ -z "${KAIDI_DB_URL:-}${KAIDI_DB_USERNAME:-}${KAIDI_DB_PASSWORD:-}" ] \
       || die "Do not pass database credentials when KAIDI_SETUP_WIZARD=true; enter them in the browser wizard"
-    DB_URL='jdbc:mysql://setup.invalid:3306/kaidi_finance'
-    DB_USERNAME=setup_pending
-    DB_PASSWORD=setup_pending
+    # First-run mode does not create a datasource. Keep database fields empty
+    # so hosting panels cannot mistake a placeholder for a local MySQL service.
+    DB_URL=
+    DB_USERNAME=
+    DB_PASSWORD=
     return 0
   fi
   if [ "$REINSTALL" = true ]; then
@@ -613,6 +615,7 @@ configure_database() {
 
 database_host() {
   local endpoint host_port
+  [ -n "$DB_URL" ] || { printf ''; return; }
   endpoint=${DB_URL#jdbc:mysql://}
   host_port=${endpoint%%/*}
   printf '%s' "${KAIDI_DB_HOST:-${host_port%%:*}}"
@@ -620,6 +623,7 @@ database_host() {
 
 database_port() {
   local endpoint host_port candidate
+  [ -n "$DB_URL" ] || { printf ''; return; }
   endpoint=${DB_URL#jdbc:mysql://}
   host_port=${endpoint%%/*}
   candidate=${host_port##*:}
@@ -629,6 +633,7 @@ database_port() {
 
 database_name() {
   local endpoint name
+  [ -n "$DB_URL" ] || { printf ''; return; }
   endpoint=${DB_URL#jdbc:mysql://}
   name=${endpoint#*/}
   name=${name%%\?*}