chore(config): Make Nacos namespace configurable

- Replace hardcoded public namespace with NACOS_NAMESPACE
- Document nacos init container troubleshooting for 1Panel deploy

backend/sql/nacos-config-init.sql

@@ -158,7 +158,7 @@ spring:
       scg:
         fallback:
           mode: response
-          response-body: '{"code":500,"message":"服务不可用，请稍后再试"}'
+          response-body: ''{"code":500,"message":"服务不可用，请稍后再试"}''
 
 gateway:
   ignore:

backend/sql/nacos-init.sh

@@ -0,0 +1,33 @@
+#!/bin/sh
+set -eu
+
+: "${MYSQL_ROOT_PASSWORD:?MYSQL_ROOT_PASSWORD is required}"
+
+MYSQL_HOST="${MYSQL_HOST:-mysql}"
+MYSQL_PORT="${MYSQL_PORT:-3306}"
+MYSQL_DB="${MYSQL_DB:-nacos_config}"
+MYSQL_USER="${MYSQL_USER:-root}"
+
+export MYSQL_PWD="$MYSQL_ROOT_PASSWORD"
+
+mysql_exec() {
+  mysql --default-character-set=utf8mb4 -h "$MYSQL_HOST" -P "$MYSQL_PORT" -u"$MYSQL_USER" "$@"
+}
+
+echo "Preparing Nacos database ${MYSQL_DB}..."
+mysql_exec -e "CREATE DATABASE IF NOT EXISTS \`${MYSQL_DB}\` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;"
+mysql_exec "$MYSQL_DB" < /init-sql/nacos-schema.sql
+
+if row_count="$(mysql_exec -N -s -e "SELECT COUNT(*) FROM \`${MYSQL_DB}\`.config_info;" 2>/dev/null)"; then
+  :
+else
+  row_count=0
+fi
+
+if [ "${row_count}" -eq 0 ]; then
+  echo "Seeding default Nacos configs..."
+  mysql_exec "$MYSQL_DB" < /init-sql/nacos-config-init.sql
+else
+  echo "Nacos config already exists, skip seeding."
+fi
+