Add Grok API and OAuth support

[RasulOs]

Summary

• Adds first-class XAI support for grok-4.5 through the Responses API.
• Supports XAI_API_KEY and OAuth setup with mobilerun configure xai.
• Supports text, tools, images, structured output, streaming, and usage accounting.
• Adds provider configuration, concise CLI documentation, and focused regressions.

Validation

• Focused provider tests: 281 passed
• Complete test suite: 570 passed, 3 subtests passed
• Scoped Ruff, lockfile, dependency, and diff checks: passed
• Android 16 / API 36 Portal gate: 12 of 12 passed

Provider	API direct	API reasoning	OAuth direct	OAuth reasoning
XAI	Passed — 46,763 tokens, 3 actions	Passed — 49,233 tokens, 4 actions	Passed — 30,867 tokens, 4 actions	Passed — 36,866 tokens, 4 actions
Anthropic	Passed — 11,339 tokens, 3 actions	Passed — 53,738 tokens, 5 actions	Passed — 39,769 tokens, 4 actions	Passed — 53,765 tokens, 5 actions
Gemini	Passed — 16,076 tokens, 3 actions	Passed — 40,815 tokens, 4 actions	Passed — 145,024 tokens, 21 actions	Passed — 30,358 tokens, 4 actions

Each live case used the exact provider and model, restored the Android 16 snapshot, required Portal UI evidence and positive usage, completed a real device action, independently verified the answer, and returned Home.

[RasulOs]

@codex review

[chatgpt-codex-connector]

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[RasulOs]

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Codex Review: Didn't find any major issues. 🚀

Reviewed commit: c76e81fd89

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[mintlify]

Docs PR opened: https://github.com/droidrun/mobilerun-docs/pull/54

Added xAI Grok provider docs to framework quickstart, CLI guide, and SDK configuration, covering API key and OAuth setup.