feat: support Redis cluster connection mode

[LordofAvernus]

User description

Related issue

https://github.com/actiontech/dms-ee/issues/937

Changes

• Support Redis standalone and Cluster connection mode submission scope for sqle.
• Preserve standalone compatibility while enabling explicit Cluster mode.

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Description

• 新增 Redis Cluster 连接模式判定逻辑

• 新增 checkDbConnectableReq 结构用于请求校验

• 添加 isRedisClusterConnectReq 函数检测连接模式

• 改进用户为空时的错误处理逻辑

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Diagram Walkthrough

flowchart LR
  A["新增 checkDbConnectableReq 结构"] -- "用于请求校验" --> B["修改 CheckInstanceIsConnectable 函数"]
  B -- "调用校验逻辑" --> C["调用 isRedisClusterConnectReq 函数"]
  C -- "返回判断结果" --> D["执行错误处理"]

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File Walkthrough

	Relevant files
Enhancement	instance.go 新增 Redis Cluster 连接模式检测及错误处理                                                          sqle/api/controller/v1/instance.go 引入 strings 包支持忽略大小写比较 新增 checkDbConnectableReq 请求结构 添加 isRedisClusterConnectReq 函数检测 Redis Cluster 模式 修改 CheckInstanceIsConnectable 中的用户为空校验逻辑 +26/-1

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[github-actions]

PR Reviewer Guide 🔍

🎫 Ticket compliance analysis 🔶 937 - Partially compliant Compliant requirements: 实现了 Redis Cluster 连接模式判定逻辑（isRedisClusterConnectReq） 新增了 checkDbConnectableReq 结构及相应错误处理逻辑 Non-compliant requirements: [] Requires further human verification: []

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review

[github-actions]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
General	改进大小写比较 建议对字符串 "cluster" 进行不区分大小写的比较，防止由于大小写不一致导致判断错误。使用 strings.EqualFold 可以提高代码的健壮性。 sqle/api/controller/v1/instance.go [248-250] if item != nil && item.Name == "connection_mode" { - return item.Value == "cluster" + return strings.EqualFold(item.Value, "cluster") } Suggestion importance[1-10]: 8 __ Why: The suggestion improves robustness by using strings.EqualFold for a case-insensitive comparison of the value "cluster", which directly enhances the behavior of the isRedisClusterConnectReq function.	Medium