dsh-playwright-native: Registering local native Playwright CLI as a DeepSeek Harness pass-through tool

# Introduction Integrating Playwright with an Agent typically involves a semantic wrapper: splitting `test`, `install`, and `show-report` into multiple tools and designing a parameter schema for each subcommand. The problem with this path is that the Playwright CLI already possesses a complete feature set. No matter how comprehensive the mapping in the wrapper layer, options are inevitably missed, and the range of capabilities actually available to the Agent depends on the wrapper author. In DSH (DeepSeek Harness), "everything is a plugin"; all tools visible to the model originate from plugin registration. Thus, an alternative approach emerged: register a pass-through tool that passes the parameters provided by the Agent directly to the local CLI. `mitao-su/`