feat: support app launch arguments and feature flags

[wxxion]

Add an optional launchArgs parameter to mobile_launch_app while preserving existing launch behavior when arguments are absent.

• pass argument pairs through Android intent extras, go-ios, and simctl
• keep mobilecli for normal simulator launches and use simctl only for non-empty launch arguments
• validate inputs before side effects, reject NUL values, and quote Android remote-shell values
• cover Android, iOS, simulator, and MCP launch boundaries

Relates to #370

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