Security fixes, ready-to-deploy image, and rewritten docs

Audit fixes:

- Wallet names were used unvalidated as file paths, so a name like
  "../<other-id>/x" reached another user's wallet directory or overwrote
  bot_settings.json. Names are now validated and every path is resolved and
  confirmed to sit inside the caller's own directory, which also blocks a
  planted symlink from escaping.
- Tor mode leaked: the mempool.space fee check opened a direct clear-net
  connection, tying the server's IP to its Bitcoin activity. It now goes
  through Tor's SOCKS proxy to mempool's onion service, DNS included.
- The xpub message was left in the chat forever. It reveals the wallet's whole
  address and balance history, so it is now deleted like the password is.
- Inline buttons stay live on old messages, so a user removed from the
  allow-list could keep using them. Callbacks re-check authorisation, and
  auth_check now works for callback queries instead of raising on a null
  message.
- Wallet names echoed back in callback_data are confirmed against the user's
  real wallet list.
- Settings are written via temp file + atomic rename; a crash mid-write used
  to truncate the file and lose every user's wallet selection.
- Replies were sent against messages that had just been deleted; deletion is
  now best-effort and cannot abort the flow.

Deployment:

- Allow-list can come from ALLOWED_USERS instead of a bind-mounted file, so a
  deployment needs no files on disk. Both sources merge when both are present.
- A missing bind-mounted allowed_users.txt made Docker create a directory in
  its place and silently lock everyone out; the entrypoint now detects that
  and stops with an explanation.
- Standard mode honours ELECTRUM_SERVER, which previously only worked in Tor
  mode despite being documented.
- Added VERSION, push.sh, docker-compose.deploy.yml and .env.deploy.example
  for a two-file deploy off the published image.

Docs rewritten in English and Persian around the name Telegtrum, leading with
the security model and what it does not protect against.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

push.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+REGISTRY="git.goyban.com"
+USER="goyban"
+IMAGE="telegtrum"
+
+# version from arg, else from the VERSION file, e.g. ./push.sh 1.0.1
+VERSION="${1:-$(cat VERSION)}"
+ELECTRUM_VERSION="${ELECTRUM_VERSION:-4.7.2}"
+
+BASE="${REGISTRY}/${USER}/${IMAGE}"
+
+echo "▶ Building ${BASE}:${VERSION} (Electrum ${ELECTRUM_VERSION}) ..."
+docker build --build-arg "VERSION=${ELECTRUM_VERSION}" -t "${BASE}:${VERSION}" .
+
+if [ "${VERSION}" != "latest" ]; then
+  echo "▶ Tagging as latest ..."
+  docker tag "${BASE}:${VERSION}" "${BASE}:latest"
+fi
+
+echo "▶ Pushing ${BASE}:${VERSION} ..."
+docker push "${BASE}:${VERSION}"
+
+if [ "${VERSION}" != "latest" ]; then
+  echo "▶ Pushing ${BASE}:latest ..."
+  docker push "${BASE}:latest"
+fi
+
+echo "✓ Done: ${BASE}:${VERSION} + ${BASE}:latest"
+echo
+echo "To deploy:  docker compose -f docker-compose.deploy.yml pull && \\"
+echo "            docker compose -f docker-compose.deploy.yml up -d"