Add local DocumentDB Quick Start design

[guanzhousongmicrosoft]

Summary

• Add a UX-focused design doc for Local Quick Start: installing, starting, connecting to, and managing DocumentDB Local from the extension.
• Capture learnings from the vscode-cosmosdb emulator attach-only flow.
• Include ASCII user flows, lifecycle states, edge cases, and design review findings/resolutions.

Validation

• npx prettier --check docs/ai-and-plans/local-quickstart/local-quickstart.md

[github-actions]

✅ Code Quality Checks

Check	Status	How to fix
Localization (l10n)	✅ Passed
ESLint	✅ Passed
Prettier formatting	✅ Passed

This comment is updated automatically on each push.

[guanzhousongmicrosoft]

Closing this fork PR because the branch and PR were recreated in microsoft/vscode-documentdb: microsoft#653

[github-actions]

📦 Build Size Report

Metric	Size
VSIX (vscode-documentdb-0.8.0-beta.vsix)	6.76 MB
Webview bundle (views.js)	5.79 MB

⚠️ No baseline cached for next yet — delta will appear after the next push to that branch.

Download artifact · updated automatically on each push.