Expand description
Serve the embedded deprecated v1 dashboard (no Node toolchain — assets are compiled in).
Superseded by crate::dashboard_v2, which serves / since #191. This one
moved to /v1 and renders a deprecation notice pointing home. It is kept
rather than deleted so an operator who hits a v2 regression has somewhere to
land; removing it is a follow-up once v2 has a release of real-world use.
Note it carries known defects v2 was built to fix — most visibly #106, where a tool call whose finish frame has a blank name stays “running” forever.