dsh-local-hanaccount: Access Gateway Plugin for Local DSH Web

`dsh-local-hanaccount` is a single-operator access gateway plugin designed for local DeepSeek Harness (DSH) web profile configurations. It provides a unified login entry point, supports password, passkey, and SSH key authentication, and includes IP allowlist/blocklist, session management, and Nginx integration features. By default, the plugin protects all business routes, follows a fail-closed policy, and does not interfere with DSH’s native session management. It is suitable for scenarios requiring a controllable access lock for local web services.