Update README with Mistral pre-exported .pte files info and demo app video

[mergennachin]

Added a tip about pre-exported .pte files for Mistral. And also add the demo video

[pytorch-bot]

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❌ 1 Cancelled Job, 2 Unrelated Failures

As of commit d55ab1b with merge base 6abcb53 ():

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / test-static-llama-qnn-linux (stories_260k_bc) / linux-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Test Metal Backend / export-model-metal-artifact (nvidia, parakeet-tdt, quantized-int4-metal) / macos-job (gh) (similar failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

BROKEN TRUNK - The following job failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Test Metal Backend / export-model-metal-artifact (nvidia, parakeet-tdt, non-quantized) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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[Copilot]

Pull request overview

Adds a documentation tip pointing readers to Mistral’s pre-exported .pte artifacts to simplify getting started with Voxtral Realtime via select backends.

Changes:

• Added an admonition tip referencing pre-exported .pte files published by Mistral
• Linked to the model’s Hugging Face Hub page for downloads

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