Use the LazyVim oxc extra instead of hand-rolled oxlint config

The oxlint LSP now enables type-aware linting on its own when tsgolint is
present and .oxlintrc.json mentions typescript, and ships :LspOxlintFixAll --
which is what the oxlint_fix function reimplemented by shelling out to the CLI.
The extra also sets fixKind = "all" and prefers the top-level oxlint config in
monorepos. Fixes now apply as a workspace edit instead of writing to disk and
reloading.

oxfmt takes js/ts/json/vue over prettier; prettier keeps css/html/yaml/markdown.
Add oxlint to mason so it resolves outside projects with a local install.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

lua/plugins/linting.lua

@@ -1,16 +1,7 @@
 return {
   "mfussenegger/nvim-lint",
   opts = {
-    linters_by_ft = {
-      javascript = { "oxlint" },
-      typescript = { "oxlint" },
-      javascriptreact = { "oxlint" },
-      typescriptreact = { "oxlint" },
-    },
     linters = {
-      oxlint = {
-        prepend_args = { "--type-aware" },
-      },
       ["markdownlint-cli2"] = {
         prepend_args = {
           "--config",