Class generics cannot inherit directly from the generic

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, Type Checking

### Expected Behaviour

When defining a generic class, the class should be able to inherit directly from the generic, allowing an extension of the generic
```lua
---@class Example: T
---@field thing boolean
```

### Actual Behaviour

Lua diagnostics reports "undefined class \`T\`"

### Reproduction steps

Copy the following into VSCode
```lua
---@class Example: T
```

Hover over the second `T`

### Additional Notes

_No response_

### Log File

_No response_

Reproduce the issue in the Visual Studio Code extension using the provided generic-class annotation, then trace how class annotations and generic type parameters are resolved. Verify the fix by confirming that the second T is recognized as the inherited generic type and no undefined-class diagnostic appears.

Written by the indexing model from the issue text.