[Feature]: Support physical iOS devices in the Device hub

[D-Seonay]

Problem
The Device hub can open and control iOS Simulators, and there is ongoing work for physical Android devices (#12765, via scrcpy). Physical iPhones are not supported, so I can't preview or let agents interact with my app on a real device, where behavior often differs from the Simulator (camera, push notifications, performance, haptics, real network conditions).

Proposed solution
Detect iPhones connected over USB or the local network, show their screen in the Device panel, and forward taps, swipes, and text input, ideally with agent device access like simulators get today.

Possible implementation paths

Screen capture: iOS devices expose their screen as a CoreMediaIO capture source on macOS (the mechanism QuickTime uses for screen recording).
Input and automation: WebDriverAgent / XCUITest, the approach used by Appium and mobile-mcp, can drive physical devices.
Device discovery and app install/launch: xcrun devicectl.

Smallest useful scope
macOS only, one USB-connected iPhone: view the screen, tap/swipe/type, take screenshots for agent inspection. Install/launch, recording, and multiple devices can come later.

Alternatives considered
macOS iPhone Mirroring and QuickTime can display the device, but they aren't integrated into T3 Code and agents can't control them.