dsh-service-watchdog: DeepSeek Harness Service Control and Self-Healing Plugin

`dsh-service-watchdog` is an `admin-security` plugin maintained by LucienLL, designed to address the problems in DeepSeek Harness (DSH) maintenance where manual restarts can easily cause context loss and leftover processes. It integrates service restart, monitoring, and watchdog capabilities into the sidebar UI. Core features include real-time service status monitoring, quick restart with a secondary confirmation, watchdog self-healing based on a separate process, hot code updates, autostart at boot, and prevention of residual processes. The plugin also provides security features such as listening only on local ports, filtering sensitive environment variables, and preventing accidental termination of processes. Installation is performed via the CLI, and the watchdog port and autostart options can be configured in settings.