feat: add macOS support

[yueliang13]

Summary

Add initial macOS support for clashctl.

Changes

• Add Darwin/macOS binary download support for:
  • mihomo
  • yq
  • subconverter
• Add launchd service support via a new plist template.
• Support macOS-compatible command handling for:
  • port detection
  • local IP detection
  • random port generation
  • sed -i
  • rm
  • tr with /dev/urandom
  • TUN status detection
• Update install flow so resources/config are prepared before service registration/startup.
• Update README to document macOS support.

Notes

• macOS currently supports mihomo only.
• clash kernel remains Linux-only.
• TUN mode on macOS may require elevated permissions.

Validation

• Ran shell syntax checks with bash -n.
• Validated launchd plist with plutil -lint.
• Verified macOS release asset URLs for mihomo, yq, and subconverter.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
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