Fix stale session redirect loop, recording metadata in polling, and P…

…AF table label

- Clear stale session cookie via middleware when pages detect invalid session,
  breaking the login/dashboard redirect loop on container restart
- Return all recording fields from GET /api/analyses/[id] so metadata
  (duration, sampling rate, channels, etc.) persists after polling updates
- Remove redundant "Peak Frequencies by Channel" subtitle that overlapped
  the PAF table rows

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Updated EEG graph, enabled manual artifacting, and allowed choice for…

… ICA vs. Manual

Update README with Docker deployment instructions

- Document both Docker and Cloud deployment modes
- Add architecture diagrams for both modes
- Comprehensive Docker quick start guide
- Environment variables reference
- Data persistence and backup instructions
- Troubleshooting section
- Updated project structure

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

update viewer for EEG