dsh-bottom-info-bar: Replaces the bottom status bar with real-time balance and spending view

Based on the native statistics line feature in DeepSeek Harness (DSH), the `dsh-bottom-info-bar` plugin replaces it with a detailed data bar showing provider, model, balance, subscription quota, peak/off-peak pricing, and session cost. It supports switching between full and compact modes, as well as multilingual support. The installation command is `dsh plugin --profile web add dsh-bottom-info-bar`; a restart is required for the changes to take effect. Data is stored locally, and uninstalling does not automatically clean up the ledger.