fix(community): mount real host data dir into helper

Helper used DATA_DIR (in-container path) for bind-mount source.
Daemon created phantom /data on host, log + staging went there
instead of /opt/amnezia-admin-data. Resolve HOST_DATA_DIR via env
or docker inspect; place staging under DATA_DIR so single mount
exposes both log and install.sh to helper.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/install.sh

@@ -274,6 +274,7 @@ docker run -d --name "${CONTAINER_NAME}" --restart unless-stopped \
   -p "${HOST_PORT}:3980" \
   -v /var/run/docker.sock:/var/run/docker.sock \
   -v "${DATA_DIR}:/data" \
+  -e "HOST_DATA_DIR=${DATA_DIR}" \
   "${RUN_ENV[@]}" \
   amnezia-admin:latest