SUGGESTION tags to filter modules on https://deno.land/x

example of tags: webserver, UI, noSQL, SQL, API, etc

## Inspirations
https://crates.io/

https://juliapackages.com/

https://hackage.haskell.org/packages/

https://hackage.haskell.org/packages/browse

https://hex.pm/packages

https://www.clojure-toolbox.com/

https://search.maven.org/

https://kotlin.libhunt.com/categories

https://common-lisp.net/libraries

https://cobolget.com/

https://packages.lazarus-ide.org/

https://fortran-lang.org/en/packages/

https://catalog.pharo.org/

https://ocaml.org/packages

https://cran.r-project.org/web/packages/available_packages_by_name.html

https://raku.land/

https://modules.raku.org/

https://libraries.io/languages/Standard%20ML

Start by reviewing the deno.land/x module listing and the linked package registries for comparable tagging and filtering approaches. Define the tag model, tagging workflow, and filtering behavior before identifying the relevant website entry points; done means modules can be consistently tagged and visitors can filter them reliably.

Written by the indexing model from the issue text.