DeepSeek Harness Key Manager: Multi-Account Pool Management and One-Click Switching

`dsh-key-manager` is a plugin for DeepSeek Harness designed to address the pain points of managing and switching between multiple API keys. It allows users to maintain a key pool on the settings page, supporting notes, renaming, and one-click activation to ensure that key switching actually takes effect. The plugin includes intelligent default selection, locking of the current key, and persistent storage. Keys are stored in plaintext in the local data directory, so proper file permissions and security should be observed. This tool provides developers with fine-grained resource management and simplifies workflows in multi-account scenarios.