fix(deploy): bound service stop so restarts can't hang

systemctl restart was hanging indefinitely: lyra-web's long-lived SSE log
streams block uvicorn's graceful shutdown forever. Add TimeoutStopSec=10 +
KillMode=mixed to both units so stop is bounded (SIGTERM, then SIGKILL the
cgroup) and restart always completes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

deploy/lyra-dream.service

@@ -5,11 +5,12 @@ Documentation=https://github.com/serversdown/project-lyra
 [Service]
 Type=simple
 WorkingDirectory=/home/serversdown/project-lyra
-# Clear any stray VIRTUAL_ENV so uv resolves the project's own .venv.
 UnsetEnvironment=VIRTUAL_ENV
 ExecStart=/home/serversdown/.local/bin/uv run lyra-dream --loop 1800
 Restart=on-failure
 RestartSec=30
+TimeoutStopSec=10
+KillMode=mixed
 
 [Install]
 WantedBy=default.target