dsh-account-usage: Account Overview and Quota Management in the DSH Settings Panel

The DeepSeek Harness plugin `dsh-account-usage` provides a one-stop management solution in the DSH settings panel for DeepSeek platform balance and usage, as well as OpenCode Go quota. It supports viewing spending amounts, token consumption, and model-by-model details, with multiple time dimensions and visual charts. A DeepSeek platform token must be configured during installation, while the OpenCode Go quota is usually obtained automatically. The plugin refreshes every 60 seconds, supports both Chinese and English interfaces, and stores data locally only to ensure security.