Add session logs: Gitea domain fix and backup setup (2025-11-23)

Documents completed work including:
- Fixed Gitea login 404 by updating domain to git.pdmarf.co.uk
- Configured ROOT_URL and SSH_DOMAIN for Pangolin tunnel access
- Set up automated daily database backups (2 AM cron, 7-day retention)
- Tested and verified backup/restore process

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

session-logs/README.md

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+# Session Logs
+
+This directory contains session summaries for sysadmin work performed on the homelab infrastructure.
+
+## Naming Convention
+
+Session logs are named using the format: `session-YYYY-MM-DD.md`
+
+If multiple sessions occur on the same day, append a sequence number: `session-YYYY-MM-DD-2.md`
+
+## Purpose
+
+- Document completed work for future reference
+- Track configuration changes
+- Provide audit trail for troubleshooting
+- Serve as knowledge base for recurring tasks
+
+## Related Files
+
+- `../gitea-installation-session-summary.md` - Initial Gitea installation session
+- `../agents/sysadmin-session-closer.md` - Agent prompt for session documentation