Add per-PR review state aggregation by fetching reviews concurrently
via the existing semaphore pattern. Display review status (approved,
changes requested, awaiting) and merge status (ready/conflicts) as
compact badges in each PR card row.
- Add ReviewState field to PullRequest struct
- Add GetPullReviewState() and EnrichPullsWithReviewState() to client
- Call enrichment in ListPulls handler after fetching PRs
- Update pulls template with review and merge badges
- Add CSS for .review-badge and .merge-badge classes
Closesleeworks-agents/gitea-mobile#97
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>