dsh-header-balance: DeepSeek Balance Chip

The `dsh-header-balance` plugin, maintained by `lijunyu726`, adds a visual “balance chip” to the header of DSH session pages. It securely handles API keys through host-side logic and supports features such as checking the balance, top-up on click, manual/automatic refresh, and viewing details on hover. Once installed, it allows quick monitoring of account status in the DSH interface.