Add the ability to assign users to issues from the mobile app:
- New ListCollaborators client method fetches repo collaborators
- New AssignIssue client method sets assignees via PATCH API
- New POST /issues/{owner}/{repo}/{index}/assignees handler
- Assignee dropdown populated with repo collaborators in issue detail
- HTMX inline response confirms assignment without page reload
Closesleeworks-agents/gitea-mobile#50
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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