feat: 允许重命名实例时使用原名

[Mine-diamond]

在之前的逻辑中，当用户点击“重命名实例”时，弹窗默认显示的名称是实例的原名。由于校验器会检查名称是否已存在，导致用户一打开弹窗就会看到“此实例已存在”的错误提示。

此外，用户通常认为“重名”是指与其他实例名称冲突，保持原名不应被视为错误。这不符合用户的使用习惯，且容易造成误导。
现在会进行判断，如果是原名则什么都不做。

之前
现在

[neveler]

感觉原名不给校验提示就可以，确定按钮应继续保持禁用状态。

[Mine-diamond]

感觉原名不给校验提示就可以，确定按钮应继续保持禁用状态。

但是禁用状态与校验器状态绑定，没办法在校验器不报错时禁用确定按钮

[Copilot]

Pull request overview

This PR improves the user experience when renaming game instances by allowing users to keep the original name without triggering a validation error. Previously, when the rename dialog opened with the instance's current name pre-filled, the validator would immediately show an "instance already exists" error, which was confusing since users typically expect "duplicate name" to mean a conflict with a different instance.

Key changes:

• Modified the validator to allow the original name as a valid input
• Added early return logic to skip unnecessary file system operations when the name hasn't changed

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