ci: deploy prebuilt static HF Space demo

[ysdede]

Summary

• Changes HF Space deploy to build the Vite demo in GitHub Actions.
• Pushes prebuilt static files to HF with hf upload --delete '*'.
• Removes HF-side static build config.
• Defaults manual deploys to private test Space: ysdede/parakeet.js-test.

Verification

• Local export built successfully.
• Pushed prebuilt export to ysdede/parakeet.js-test.
• GitHub Actions workflow dispatch succeeded on this branch.
• HF test Space runtime is RUNNING.
• Static URL returns COOP/COEP/CORP headers and README has no app_build_command.

Notes

After manual testing, switch default HF_SPACE_ID from ysdede/parakeet.js-test to ysdede/parakeet.js-demo before merging/production use.

[sourcery-ai]

Hey - I've left some high level feedback:

• In the demo build step you’re using npm install after mutating package.json; if you want reproducible CI builds similar to the root you might prefer npm ci (possibly after regenerating a lockfile) or explicitly justify the use of npm install here.
• The huggingface_hub installation in the deploy step is currently unpinned; consider pinning it to a specific major/minor version (or using a requirements.txt) to avoid future breaking changes in the CLI impacting deployments.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In the demo build step you’re using `npm install` after mutating `package.json`; if you want reproducible CI builds similar to the root you might prefer `npm ci` (possibly after regenerating a lockfile) or explicitly justify the use of `npm install` here.
- The `huggingface_hub` installation in the deploy step is currently unpinned; consider pinning it to a specific major/minor version (or using a `requirements.txt`) to avoid future breaking changes in the CLI impacting deployments.

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