Allow quickPlayMultiplayer and server options to work together for compatibility

[Copilot]

This PR enables both quickPlayMultiplayer and server/port options to be used simultaneously for compatibility, addressing the limitation introduced in PR #321.

Problem

PR #321 added support for the newer --quickPlayMultiplayer option but implemented it with exclusive logic that prevented it from being used alongside the legacy --server/--port options:

if (options.quickPlayMultiplayer) {
  cmd.push('--quickPlayMultiplayer', options.quickPlayMultiplayer)
} else if (options.server) {  // <- This 'else if' prevents both from working together
  cmd.push('--server', options.server.ip)
  // ...
}

Solution

Changed the exclusive else if to separate if statements, allowing both options to be processed independently:

if (options.quickPlayMultiplayer) {
  cmd.push('--quickPlayMultiplayer', options.quickPlayMultiplayer)
}
if (options.server) {  // <- Now both can be included
  cmd.push('--server', options.server.ip)
  // ...
}

Changes

• Modified launch.ts: Removed else from server option logic to allow both options simultaneously
• Updated test case: Changed from testing precedence to testing compatibility
• Updated documentation: Added example showing both options can be used together

Usage Example

// Both options can now be used together for compatibility
await launch({
  version: '1.20.1',
  gamePath: '/path/to/.minecraft',
  javaPath: '/path/to/java',
  quickPlayMultiplayer: 'play.hypixel.net:25565',
  server: { ip: 'play.hypixel.net', port: 25565 }
})

This generates command line arguments containing both:

--quickPlayMultiplayer play.hypixel.net:25565 --server play.hypixel.net --port 25565

Backward Compatibility

✅ Fully backward compatible - existing code using either option alone continues to work unchanged.

Fixes #323.

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