Add Python manager: FastAPI backend + web UI

- main.py: FastAPI app with profile CRUD, start/stop, send message endpoints
- profiles.py: asyncio bot lifecycle using simplex-chat Python SDK
- db.py: SQLite registry tracking profiles, types, config, addresses
- templates/: Jinja2 + HTMX web UI
  - login.html: token-based auth
  - index.html: profile list with live status polling, create dialog
  - profile.html: per-bot dashboard with QR code, contacts/groups, event log, send form
- requirements.txt: fastapi, uvicorn, jinja2, simplex-chat
- start.sh: one-command startup with venv bootstrap

Bot types: echo, broadcast, support (business address), directory, deadmans
Run: cd manager && MANAGER_TOKEN=secret ./start.sh

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

manager/start.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+set -e
+
+cd "$(dirname "$0")"
+
+if [ ! -d ".venv" ]; then
+  echo "Creating virtualenv..."
+  python3 -m venv .venv
+  .venv/bin/pip install -q -r requirements.txt
+fi
+
+mkdir -p data/bots
+
+export MANAGER_TOKEN="${MANAGER_TOKEN:-changeme}"
+
+echo "Starting SimpleX Manager on http://0.0.0.0:8000"
+echo "Token: $MANAGER_TOKEN"
+
+exec .venv/bin/uvicorn main:app --host 0.0.0.0 --port 8000 --reload