feat(vscode): add Parakeet speech-to-text model

[marius-kilocode]

OpenRouter now serves nvidia/parakeet-tdt-0.6b-v3 through the transcription endpoint already used by Kilo Gateway, but the VS Code extension uses a curated speech model catalog. That prevents users from selecting Parakeet even though the existing transport supports it.

Add Parakeet TDT 0.6B v3 to the shared catalog that drives the Models settings page and every speech-input surface. Keep Whisper Large V3 Turbo as the fallback, identify NVIDIA in the selector, and leave GPT-specific prompt conditioning disabled so Parakeet receives only the existing audio and language fields.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (4 files)

• .changeset/add-parakeet-speech.md
• packages/kilo-vscode/src/speech-to-text/models.ts
• packages/kilo-vscode/tests/model-selector-accessibility.spec.ts
• packages/kilo-vscode/tests/unit/speech-to-text-models-sync.test.ts

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_{Review guidance: REVIEW.md from base branch main}