Add chat rooms, channels, sidebar nav, themes, and UI polish

Backend (profiles.py / main.py):
- Fix bot startup crash: create active user before start_chat
- Fix address-clobbering bug on restart (UserContactLink vs CreatedConnLink)
- Add user profile type alongside bots
- Channels: create groups with observer links, classify via acceptMemberRole
- Chat rooms: get_chat_history + send_to_chat, history/messages/send routes

UI:
- Chat room view with message bubbles and live polling
- Convert top nav to collapsible left sidebar (mobile-friendly off-canvas)
- Three-way Users/Bots split; clickable cards; copy-address buttons + links
- Add Matrix theme alongside Original Light/Dark
- File upload sidebar link; site footer on all pages incl. login
- Bot-type descriptions on the Bots page; QR caption on profiles

Remove orphaned index.html (superseded by list.html).
Ignore downloaded libs/, exploration DBs, and local ai.sh.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

manager/start.sh

@@ -12,6 +12,7 @@ if [ ! -d ".venv" ]; then
 fi
 
 mkdir -p data/bots
+mkdir -p static
 
 # Set token — override via: MANAGER_TOKEN=mysecret ./start.sh
 export MANAGER_TOKEN="${MANAGER_TOKEN:-changeme}"