dsh-lock: Web Password Gate for DeepSeek Harness

`dsh-lock` is an interface security plugin for DeepSeek Harness (DSH) that prevents direct operation by others through a fullscreen overlay and password verification. It supports manual locking, configurable automatic locking, and stores passwords using scrypt one-way hashing, generating only short-lived tokens. The installation command is `dsh plugin --profile web add github:felixpu/dsh-lock`, and a restart is required for it to take effect. This plugin provides UI access control only and does not involve disk encryption. When using it, make sure to configure the `locale` directory to ensure proper bilingual Chinese and English support.