docs(voxtral_realtime): simplify and reorganize README

[mergennachin]

Reduce duplication by showing one export/run example per backend instead
of separate offline and streaming blocks. Make streaming the default mode
in all examples. Collapse non-default backends (Metal, CUDA, CUDA-Windows)
behind details tags in the Export section. Restore the Linux/macOS run
example that was accidentally replaced by Windows-only commands in
1b0c10b.

[pytorch-bot]

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[github-actions]

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[Copilot]

Pull request overview

This PR reorganizes the Voxtral Realtime example README to reduce duplication and make streaming the default workflow across export and runtime instructions, while keeping non-default backends tucked away for readability.

Changes:

• Reordered the “modes” explanation and updated examples to default to streaming (--streaming) with offline as an opt-out.
• Simplified export instructions to one example per backend, collapsing Metal/CUDA/CUDA-Windows behind <details> sections.
• Restored a Linux/macOS “Basic usage” run example and moved Windows commands into a dedicated subsection.

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[Copilot]

Pull request overview

This PR reorganizes the Voxtral Realtime README to reduce duplicated instructions while making streaming the default across examples, and restores a Linux/macOS run example that had been replaced by Windows-only commands.

Changes:

• Reorders the mode explanation and standardizes all examples to streaming by default, with offline guidance via “omit --streaming”.
• Collapses non-default backend export examples (Metal/CUDA/CUDA-Windows) behind <details> blocks.
• Updates build/run sections to present a basic POSIX usage path plus a focused Windows PowerShell example.

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