feat(links): wire up nuwiki.links.generateForPath (scoped GenerateLinks)

`:VimwikiGenerateLinks <path>` sent nuwiki.links.generateForPath, but the
server had no handler and didn't advertise it — so the scoped form was
silently dropped (only the no-arg form worked). Register and implement it.

The page list is scoped via page_in_scope: a plain `path` is a directory
subtree (the page itself or anything under `<path>/`); a `path` with `*`/`?`
is a glob pattern (upstream's behaviour), matched with export::glob_match
(now pub(crate)). links_generate and the scoped form share
links_generate_scoped, so cursor-line insertion + captions + config all
apply uniformly.

Tests: page_in_scope unit tests (subtree, glob, prefix-sibling, trailing
slash) + COMMANDS advertises both generate forms. 580 passed, clippy
clean, harnesses green. Doc updated with the [path] argument.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/nuwiki-lsp/src/export.rs

@@ -329,7 +329,7 @@ fn escape_html(s: &str) -> String {
 /// Minimal glob match for `exclude_files`. Handles `*`, `**`, `?` and
 /// literal characters. No character classes — those aren't needed for
 /// "exclude foo/*.tmp" style patterns.
-fn glob_match(pattern: &str, text: &str) -> bool {
+pub(crate) fn glob_match(pattern: &str, text: &str) -> bool {
     glob_impl(pattern.as_bytes(), text.as_bytes())
 }