dsh-accounts: DSH Credential Bridge Plugin

dsh-accounts is a DeepSeek Harness (DSH) plugin designed to address credential leakage risks. It isolates sensitive information from the AI execution environment to ensure models cannot access plaintext values. Core features include automated form filling via browser tools, injecting credentials into environment variables to run local CLIs, and querying account lists. The plugin strictly adheres to security protocols and supports domain allowlist restrictions and output redaction. Users can install it via command and manage accounts through the built-in web management interface (`/dsh-accounts/`), with local validation mechanisms for operations.