iOS precompiled binaries in React Native 0.84.1 ignore custom Metro ports

Description

React Native 0.84.1 introduces a regression where iOS builds using the precompiled binary do not respect custom Metro bundler ports.

When running Metro on a non-default port, the application is unable to connect correctly and behaves as though it is still attempting to use the default port. This prevents development workflows that require running Metro on an alternative port.

This issue appears to be specific to iOS builds using the precompiled binary and was not present in the previous React Native version tested.

Steps to reproduce

• Clone the reproduction repository.
• Install dependencies:
  npm install
• Start Metro on a custom port:
  npx react-native start --port 8082
• In another terminal, build and run the iOS application using the custom Metro port:
  npx react-native run-ios --port 8082
• Observe that the application does not connect to Metro running on port 8082 when using the iOS precompiled binary and instead attempts to use the default Metro port.

React Native Version

0.84.1

Affected Platforms

Runtime - iOS

Output of npx @react-native-community/cli info

System:
  OS: macOS 26.5.1
  CPU: (14) arm64 Apple M4 Pro
  Shell:
    version: "5.9"
    path: /bin/zsh

Binaries:
  Node:
    version: 22.11.0
  npm:
    version: 10.9.0
  Watchman:
    version: 2025.10.27.00

Managers:
  CocoaPods:
    version: 1.16.2

SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 25.0
      - iOS 26.0
      - macOS 26.0
      - tvOS 26.0
      - visionOS 26.0
      - watchOS 26.0

IDEs:
  Xcode:
    version: 26.0.1/17A400
    path: /usr/bin/xcodebuild

Languages:
  Java:
    version: 17.0.17
  Ruby:
    version: 3.2.2

npmPackages:
  "@react-native-community/cli":
    installed: 20.1.3
    wanted: 20.1.3
  react:
    installed: 19.2.3
    wanted: 19.2.3
  react-native:
    installed: 0.84.1
    wanted: 0.84.1

iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

No stack trace is generated. The application launches, but it is unable to connect to the Metro bundler when using a non-default port.

The simulator says: 
No script URL provided. Make sure the packager is running or you have embedded a JS bundle in your application bundle.

MANDATORY Reproducer

https://github.com/Sacha1995/RN084MetroPortRepro

Screenshots and Videos

No response

从 https://github.com/Sacha1995/RN084MetroPortRepro 中的必需 reproducer 开始，并使用 issue 中的命令在端口 8082 上运行 Metro 和 iOS 应用。然后跟踪 iOS 预编译二进制文件如何接收或构造 Metro 连接 URL，并将 React Native 0.84.1 与之前正常工作的版本进行比较。当应用连接到自定义端口上的 Metro，而不是回退到默认端口时，即表示完成。