DSH Web Quota Table Plugin

The DSH Web Quota Dashboard plugin is designed to help developers monitor in real time their DeepSeek account balance, today's API usage, and peak/off-peak pricing periods. As a pluggable component, it retrieves the official balance through the official API and estimates today's usage using a local algorithm. It supports customizing the daily reset time (05:00 by default) and displays whether the current period is peak or off-peak. Installation is simple; restart `dsh web` to load the plugin automatically. Its API key is stored only in the official credential store. Balance estimation is based on a baseline value set at each daily reset, so top-ups may cause the displayed value to appear lower, and restarting resets the baseline.