fix GitHub import endpoint

[saurabhhhcodes]

What changed

• Added a real POST /api/github/import endpoint that imports public GitHub repos into a new playground.
• Handles monorepos by returning selectable subdirectories when multiple project roots are detected.
• Hardened the client so it no longer throws the raw Unexpected token < JSON parse error when the endpoint returns HTML or another non-JSON response.

Why

The import dialog was calling /api/github/import, but no route existed, so the browser was trying to parse the HTML 404 page as JSON.

Closes #223

Validation

• npx vitest run app/api/github/import/utils.test.ts
• npx eslint app/api/github/import/route.ts app/api/github/import/utils.ts modules/dashboard/components/github-import-dialog.tsx
• git diff --check

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