Bot hosting: releases are self-contained CI bundles, and the bot serves its own web UI

The image no longer installs the bot's dependencies: its CI builds one tar.gz holding the app plus a
vendor/ directory of prebuilt wheels, and PYTHONPATH=/app/vendor makes the code import them. A new
dependency therefore needs no image rebuild and the server contacts no package index.

- deployBotBundle.sh: install / --latest / --status / --rollback, verifies every file against BUILD.json
  and keeps the previous release beside the live one.
- compose: mount ${BOT_APP_DIR:-/srv/bot/app} at /app, set DB_BACKEND, DATA_DIR, WEB_ALLOWED_GROUPS,
  WEB_SERVE_UI and PYTHONPATH. bot/app placeholder untracked; install.sh creates /srv/bot/app.
- The placeholder requirements would have crashed the bot on import (no sqlglot), which is why the
  image now ships none of them.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

bot/.dockerignore

@@ -1,2 +1,4 @@
-app/__pycache__/
-app/*.pyc
+# only entrypoint.sh is COPYed; keep everything else out of the build context
+app/
+AGENT.md
+README.md