feat(server): 支持 MySQL 一主多从拓扑调度与复制健康检查

- DeliveryTask/DeploymentResult 新增 target_hosts/target_host_ips 完整节点列表(主节点在前)
- 交付输入支持 replica_count(1-7)与有序 target_hosts,按节点数放大配额/预留/资源用量
- 端口占用与已占主机解析改为逗号列表,兼容存量单主机字段
- 指定主机校验池成员/重复/单机实例数,自动补齐剩余节点或延后调度
- AWX Limit 与回滚覆盖全部节点,extra_vars 下发主从主机与 IP 列表
- completeTask 全节点 TCP 探活,副本经 mysqlReplicationReady 校验复制线程状态
- awxTaskSummary 按服务类型生成摘要;go-sql-driver/mysql 提为直接依赖

server/go.mod

@@ -5,6 +5,7 @@ go 1.26
 require (
 	github.com/gin-gonic/gin v1.11.0
 	github.com/golang-jwt/jwt/v5 v5.3.0
+	github.com/go-sql-driver/mysql v1.8.1
 	github.com/swaggo/files v1.0.1
 	github.com/swaggo/gin-swagger v1.6.1
 	github.com/swaggo/swag v1.16.3
@@ -30,7 +31,6 @@ require (
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.27.0 // indirect
-	github.com/go-sql-driver/mysql v1.8.1 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
 	github.com/goccy/go-yaml v1.18.0 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect