[codex] Add direct HarmonyOS simulator launch support

[dongweiq]

Summary

• Add HarmonyOS simulator discovery and menu integration.
• Launch DevEco HarmonyOS emulators directly from MiniSim without opening DevEco Studio.
• Add a private HarmonyEmulator.app helper bundle with macOS camera and microphone usage descriptions.
• Prevent simulator shutdown from being reported as a blocking MiniSim shell error.
• Add HarmonyOS parser, launch, and helper-bundle tests.
• Add a script for building an unsigned universal DMG.

Root cause

On macOS, the DevEco emulator executable is distributed as a bare executable without an Info.plist. When it accesses the host camera, macOS terminates it because NSCameraUsageDescription is missing. The crash dump reports:

This app has crashed because it attempted to access privacy-sensitive data without a usage description.
NSCameraUsageDescription

This change keeps MiniSim's direct-launch workflow by creating a cached helper app bundle under the user's Application Support directory. The original DevEco installation and emulator data are not modified.

Validation

• xcodebuild ... build succeeded.
• Full macOS XCTest suite passed.
• Verified the helper bundle contains NSCameraUsageDescription and NSMicrophoneUsageDescription.
• Verified a universal arm64/x86_64 DMG build.

Notes

The helper bundle reuses the DevEco emulator's original directory layout so its Qt plugins and dynamic-library run paths continue to work.