Validate Vite config outDir matches expected dist/ location

[fasterthanlime]

When using Vite integration, dodeca expects the build output at dist/ (sibling to content/), but users might configure outDir: "static/dist" or other locations in their vite.config.ts.

Dodeca should:

1. Check if vite.config.ts exists and parse the outDir setting
2. Warn if it doesn't match the expected dist/ location
3. Or better: read the outDir from vite config and use that instead of hardcoding dist/

This would prevent confusion when the manifest isn't found because it's in the wrong place.