fix(lsp): send g:nuwiki_wikis to the server so per-wiki roots are known

The server received only wiki_root (the parent directory) and had no
knowledge of the per-wiki sub-roots configured in g:nuwiki_wikis / the
setup() wikis list. It therefore resolved all links relative to the
parent root, causing every link in a sub-wiki to appear broken.

Vim path (autoload/nuwiki/lsp.vim):
  s:settings() now includes a 'wikis' key when g:nuwiki_wikis is set,
  so the initialization_options and settings payloads carry the full
  per-wiki config (root, diary_rel_path, file_extension, …).

Lua path (lua/nuwiki/lsp.lua):
  Add resolved_opts() which merges vim.g.nuwiki_wikis into
  config.options.wikis when the user configures via VimL rather than
  setup({wikis=…}). init_options(), server_settings(), and the
  pre-0.11 root_dir_for() fallback all use resolved_opts() so the
  server receives the correct per-wiki roots in every code path.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

autoload/nuwiki/lsp.vim

@@ -76,10 +76,18 @@ function! s:bin_path() abort
 endfunction
 
 function! s:settings() abort
-  return {
+  let l:cfg = {
         \ 'wiki_root':      get(g:, 'nuwiki_wiki_root',      '~/vimwiki'),
         \ 'file_extension': get(g:, 'nuwiki_file_extension', '.wiki'),
         \ 'syntax':         get(g:, 'nuwiki_syntax',         'vimwiki'),
         \ 'log_level':      get(g:, 'nuwiki_log_level',      'warn'),
         \ }
+  " Include the per-wiki list when configured via g:nuwiki_wikis so the
+  " server knows each wiki's root, diary path, etc. Without this it only
+  " sees wiki_root and resolves links relative to that directory instead
+  " of the individual wiki's root.
+  if exists('g:nuwiki_wikis') && !empty(g:nuwiki_wikis)
+    let l:cfg['wikis'] = g:nuwiki_wikis
+  endif
+  return l:cfg
 endfunction