chore(deps): bump transitive mermaid to 11.16.1 (#4553)

## Summary

Bumps the transitive `mermaid` in the lockfile from `11.14.0` to
`11.16.1`.

`mermaid` has no direct dependents here. It arrives through
`streamdown`,
which declares it as a hard dependency even though diagram rendering is
gated
behind the optional `@streamdown/mermaid` plugin, which we don't
install.
`streamdown@2.5.0` is its latest release, and its declared range
(`^11.12.2`)
already permits `11.16.1`, so this was a stale lockfile pin rather than
a
range conflict.

Done as a scoped override rather than a bare lockfile refresh, so the
floor
survives a lockfile regenerated from an older base:

```json
"mermaid@>=11 <11.16.1": "^11.16.1"
```

Net effect is 96 fewer lockfile lines, contained to mermaid's own
subtree.
`11.16.1` swapped out its parser, so the `langium` / `chevrotain@12` /
`vscode-languageserver-*` chain drops in favour of a single
`@chevrotain/types`, and `lodash-es` and `uuid@11` are no longer pulled
at
all.

The override goes away once `streamdown` makes `mermaid` an optional
peer of
its diagram plugin instead of a hard dependency.

Author: nicktrn

package.json

@@ -140,6 +140,7 @@
       "brace-expansion@<1.1.13": "1.1.13",
       "brace-expansion@>=2 <2.0.3": "2.0.3",
       "brace-expansion@>=5 <5.0.6": "5.0.6",
+      "mermaid@>=11 <11.16.1": "^11.16.1",
       "@jsonhero/json-infer-types>ip-address": "^10.2.0",
       "@modelcontextprotocol/sdk@>=1.26.0>express-rate-limit": "^8.6.0"
     },