DeepSeek Harness Mobile Native Development Agent Preset

`dsh-app-native` is a dedicated Agent preset in DeepSeek Harness for mobile-native development (iOS, Android, and HarmonyOS). It inherits from the standard preset, overrides role behavior to cover multiple platform-native languages, and automatically detects workspace files to identify the target platform. The preset includes strict development rules that prohibit manual editing of generated configuration files and language switching. It must be used together with plugins such as `dsh-lsp-actions` and the corresponding toolchain to provide complete code intelligence, build, and debugging capabilities.