fix(setup): auto-install matrix-nio during hermes setup (#3873)

Setup previously only printed a manual install hint for matrix-nio,
causing the gateway to crash with 'matrix-nio not installed' after
configuring Matrix. Now auto-installs matrix-nio (or matrix-nio[e2e]
when E2EE is enabled) using the same uv-first/pip-fallback pattern
as Daytona and Modal backends.

Also adds hermes-agent[matrix] to the [all] extra in pyproject.toml
and a regression test to keep it there.

Co-authored-by: Gutslabs <Gutslabs@users.noreply.github.com>
Co-authored-by: cutepawss <cutepawss@users.noreply.github.com>

pyproject.toml

@@ -71,6 +71,7 @@ all = [
   "hermes-agent[modal]",
   "hermes-agent[daytona]",
   "hermes-agent[messaging]",
+  "hermes-agent[matrix]",
   "hermes-agent[cron]",
   "hermes-agent[cli]",
   "hermes-agent[dev]",