duplicate-doc-alias with enum

Nobody has claimed this yet.

### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Windows

### What is the issue affecting?

Annotations

### Expected Behaviour

It should not prompt "duplicate-doc-alias"

### Actual Behaviour

An enum was defined using the `---@enum` annotation, and then LuaLS warned "duplicate-doc-alias". Changing the enum name had no effect. After moving the file containing the enum definition to a different VS Code workspace, the issue no longer occurred.

### Reproduction steps

无法复现，该问题只在一个特定的工作区中出现。

### Additional Notes

Unable to reproduce. This issue only occurs in one specific workspace.

### Log File

Start with the LuaLS duplicate-doc-alias diagnostic for @---@enum annotations in the Windows Visual Studio Code extension. Try to reproduce it in the reported workspace and compare behavior after moving the enum file; no source file or usable log is provided. Done means identifying the workspace-specific cause and preventing the false warning, with a regression test if reproduction becomes possible.

Written by the indexing model from the issue text.