Update all runtime-relevant references to the Forgejo bot username
from 'claude-bot' to 'claude' following the bot account rename.
- .forgejo/workflows/claude.yml: bot_name input
- docs/forgejo.md: setup guide, examples, and inline references
- CLAUDE.md: bot identity description
Test fixtures and historical PRD files are left unchanged as they
use 'claude-bot' as arbitrary mock data or historical record.
Co-authored-by: vtmocanu <vtmocanu@users.noreply.github.com>
