feat(delivery): extend MySQL delivery parameters and tighten resource bounds

- Add topology/port/data_disk, DB options and 8 advanced parameters
  with whitelist validation, rendered via extra_vars into the playbook
- Hybrid port allocation over pool 13306-13999
- Tighten bounds: memory 2048-65536 MiB, storage 20-2000 GiB

server/.env.example

@@ -22,6 +22,8 @@ DELIVERY_RESERVATION_TTL_MINUTES=120
 DELIVERY_GLOBAL_LIMIT=2
 DELIVERY_TARGET_LIMIT=2
 DELIVERY_BUSINESS_LIMIT=1
+# 数据盘挂载点白名单（逗号分隔，第一项为默认值）
+DELIVERY_DATA_DISKS=/data
 AWX_BASE_URL=
 AWX_TOKEN=
 AWX_USERNAME=