Files with names containing the "@" (at sign) show "not found"

# Bug report

Files with "@" in the name seem broken and show 404. The "@" is encoded to `%40` but the page does not load.

## OS information

Windows 11, Chrome 128.0.6613.120

## Steps to reproduce

Go to Godot `@GDScript` documentation: https://devdocs.io/godot~4.2-gdscript/ and click on any link, like https://devdocs.io/godot~4.2/classes/class_%40gdscript#class-gdscript-annotation-export

## More resources


Start by reproducing the failure at the Godot @GDScript documentation URL and compare the working and failing links, especially the class_%40gdscript anchor. Trace the URL handling for the encoded @ character and verify that links to files containing @ load instead of returning 404.

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