修复bug，进一步优化quickstart.sh

quickstart.sh

@@ -149,7 +149,7 @@ main() {
     db_url_choice=$(select_option "DATABASE_URL 配置方式:" "自动构造 PostgreSQL URL" "手动输入完整 URL")
 
     if [ "$db_url_choice" = "1" ]; then
-        POSTGRESQL_HOSTNAME=$(read_input "PostgreSQL 主机名" "")
+        POSTGRESQL_HOSTNAME=$(read_input "PostgreSQL 主机名" "postgresql")
         POSTGRESQL_DBNAME=$(read_input "PostgreSQL 数据库名" "postgres")
         POSTGRESQL_SCHEMA=$(read_input "PostgreSQL 模式名" "public")
 
@@ -170,7 +170,7 @@ main() {
     print_info "配置 Redis..."
     echo ""
 
-    REDIS_HOST=$(read_input "Redis 主机名" "")
+    REDIS_HOST=$(read_input "Redis 主机名" "redis")
     REDIS_PORT=$(read_input "Redis 端口" "6379")
     REDIS_PASSWORD=$(read_password "Redis 密码" "true")
 
@@ -182,7 +182,7 @@ main() {
     print_info "配置 MinIO 对象存储..."
     echo ""
 
-    MINIO_ENDPOINT=$(read_input "MinIO 端点地址" "")
+    MINIO_ENDPOINT=$(read_input "MinIO 端点地址" "minio")
     MINIO_API_PORT=$(read_input "MinIO API 端口" "9000")
     MINIO_CONSOLE_PORT=$(read_input "MinIO 控制台端口" "9001")
     MINIO_USE_SSL=$(read_input "MinIO 是否使用 SSL (true/false)" "false")