dsh-peak-valley: DeepSeek Harness Peak/Valley Time Reminder Floating Window

The DeepSeek Harness plugin `dsh-peak-valley` helps users monitor the current billing period in real time. This static plugin displays the current peak or off-peak status (green or orange dot) in a floating indicator at the bottom-left of the interface, with a countdown. Users can customize the time ranges in a configuration file, and changes are saved automatically. Through a lightweight UI, the plugin improves the efficiency of adjusting inference costs based on peak and off-peak electricity rates.