dogfood: webjs.nvim needs a vtsls helper + LazyVim recipe (with_tsserver_plugin is ts_ls-only)

[vivek7405]

Problem

Found while actually installing webjs.nvim in a real LazyVim setup. webjs.nvim's require('webjs').with_tsserver_plugin() returns the ts_ls config shape (init_options.plugins = {{ name, location }}). But LazyVim's TypeScript extra (and many modern setups) use vtsls, which loads tsserver plugins via a DIFFERENT key:

settings = { vtsls = { tsserver = { globalPlugins = {{ name, location, enableForWorkspaceTypeScriptVersions = true }} } } }

So with_tsserver_plugin() does nothing under vtsls, and a LazyVim user has to hand-write the globalPlugins block (which is what I did to get it working). The highlighting (treesitter) works regardless; this is only the LSP-intelligence wiring.

What worked (the manual LazyVim recipe)

-- ~/.config/nvim/lua/plugins/webjs.lua
return {
  { 'webjsdev/webjs.nvim', ft = { 'typescript', 'javascript' }, opts = {} },
  { 'nvim-treesitter/nvim-treesitter', opts = function(_, o)
      o.ensure_installed = o.ensure_installed or {}; vim.list_extend(o.ensure_installed, { 'html', 'css' }) end },
  { 'neovim/nvim-lspconfig', opts = { servers = { vtsls = { settings = { vtsls = { tsserver = {
      globalPlugins = {{ name = '@webjsdev/ts-plugin',
        location = vim.fn.stdpath('data') .. '/lazy/webjs.nvim/vendor',
        enableForWorkspaceTypeScriptVersions = true, languages = { 'javascript', 'typescript' } }} } } } } } } },
}

Verified live: vtsls attaches with globalPlugin name=@webjsdev/ts-plugin location=.../lazy/webjs.nvim/vendor, with NO @webjsdev/ts-plugin in the project (the bundle does it).

Proposed change (packages/editors/nvim)

• Add a vtsls-shaped helper, e.g. require('webjs').vtsls_settings() (or extend with_tsserver_plugin() to also emit settings.vtsls.tsserver.globalPlugins), pointing location at bundled_location().
• README: a LazyVim recipe (the block above) AND a plain-ts_ls recipe (the existing one), since they differ. Note html/css parsers (ensure_installed) and that highlighting is independent of the LSP wiring.
• selftest: assert both helper shapes (ts_ls init_options.plugins + vtsls globalPlugins) carry the bundled location.
• Re-publish the webjs.nvim mirror (subtree split) after the change.

Acceptance criteria

• A LazyVim user gets webjs LSP intelligence from a one-line require('webjs') helper, no hand-written globalPlugins.
• README documents LazyVim + ts_ls + treesitter-parser setup.

Follow-up to the editor-plugin epic (#381).