## Summary
I added URL normalization to the backend in `vibe-kanban/crates/remote/src/routes/review.rs`:
1. **Added `normalize_github_url` helper function** (lines 129-137) - Checks if the URL already has `http://` or `https://` prefix, and if not, prepends `https://`
2. **Applied normalization in `init_review_upload`** (lines 217-218) - The URL is now normalized before being stored in the database
This ensures that all GitHub PR URLs stored in the database will have the correct `https://` protocol prefix, preventing the browser from treating them as relative paths when used in `<a href>` attributes.
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