diff --git a/remount-fuse.sh b/remount-fuse.sh
new file mode 100644
index 0000000..f38c761
--- /dev/null
+++ b/remount-fuse.sh
@@ -0,0 +1,189 @@
+#!/bin/sh
+set -eu
+
+die() { printf 'xymediavault FUSE: ERROR: %s\n' "$*" >&2; exit 1; }
+log() { printf '%s xymediavault FUSE: %s\n' "$(date '+%Y-%m-%dT%H:%M:%S%z')" "$*" >>"$LOG_FILE"; }
+
+install_dir=${XYMEDIA_INSTALL_DIR:-}
+action=restart
+path_arg=
+while [ "$#" -gt 0 ]; do
+  case "$1" in
+    --configure) [ "$#" -ge 2 ] || die '--configure requires a path'; action=configure; path_arg=$2; shift 2;;
+    --restart) action=restart; shift;;
+    --disable) action=disable; shift;;
+    --install-dir) [ "$#" -ge 2 ] || die '--install-dir requires a path'; install_dir=$2; shift 2;;
+    *) die "unknown option: $1";;
+  esac
+done
+[ -n "$install_dir" ] || install_dir=$(CDPATH='' pwd -P)
+case "$install_dir" in ''|/|*[![:print:]]*) die 'installation directory is invalid';; esac
+[ -d "$install_dir" ] || die "installation directory does not exist: $install_dir"
+install_dir=$(CDPATH='' cd -- "$install_dir" && pwd -P) || die 'cannot canonicalize installation directory'
+[ "$(id -u)" -eq 0 ] || die 'FUSE maintenance requires root (euid 0)'
+INSTALL_PATH="$install_dir" python3 - <<'PY' || die 'installation path components must be root-owned and not group/world writable'
+import os, pathlib, stat
+path = pathlib.Path(os.environ['INSTALL_PATH'])
+current = pathlib.Path(path.root)
+for part in path.parts[1:]:
+    current /= part
+    info = current.lstat()
+    if info.st_uid != 0 or info.st_mode & 0o022:
+        raise SystemExit(1)
+PY
+[ -f "$install_dir/.env" ] || die "missing $install_dir/.env"
+[ -f "$install_dir/compose.yaml" ] || die "missing $install_dir/compose.yaml"
+[ -f "$install_dir/config.yaml" ] || die "missing $install_dir/config.yaml"
+[ -f "$install_dir/compose.fuse.yaml" ] || die "missing $install_dir/compose.fuse.yaml"
+[ ! -L "$install_dir/.env" ] || die '.env must not be a symlink'
+[ ! -L "$install_dir/config.yaml" ] || die 'config.yaml must not be a symlink'
+for protected in "$install_dir/.env" "$install_dir/config.yaml"; do
+  [ "$(stat -c '%u' "$protected")" -eq 0 ] || die "protected file must be owned by root: $protected"
+  [ $(( $(stat -c '%a' "$protected") & 022 )) -eq 0 ] || die "protected file must not be group/world writable: $protected"
+done
+state_dir=$install_dir/state
+if [ -e "$state_dir" ] && [ -L "$state_dir" ]; then die 'state directory must not be a symlink'; fi
+if [ ! -e "$state_dir" ]; then umask 077; mkdir "$state_dir" || die 'cannot create state directory'; fi
+[ -d "$state_dir" ] || die 'state path must be a directory'
+[ "$(stat -c '%u' "$state_dir")" -eq 0 ] || die 'state directory must be owned by root'
+[ $(( $(stat -c '%a' "$state_dir") & 022 )) -eq 0 ] || die 'state directory must not be group/world writable'
+[ -e /dev/fuse ] && [ -c /dev/fuse ] || die '/dev/fuse character device is required'
+command -v docker >/dev/null 2>&1 || die 'docker is required'
+docker compose version >/dev/null 2>&1 || die 'Docker Compose V2 is required'
+command -v findmnt >/dev/null 2>&1 || die 'findmnt is required'
+command -v mountpoint >/dev/null 2>&1 || die 'mountpoint is required'
+case "${DOCKER_HOST:-}" in ''|unix://*|unix:/*) ;; *) die 'remote Docker contexts are not allowed';; esac
+
+read_env() { awk -F= -v wanted="$1" '$1 == wanted {sub(/^[^=]*=/, ""); print; exit}' "$install_dir/.env"; }
+old_enabled=$(read_env XYMEDIA_FUSE_ENABLED || true)
+old_path=$(read_env XYMEDIA_FUSE_HOST_PATH || true)
+case "$old_enabled" in true|false) ;; *) old_enabled=false;; esac
+mount_id= mount_source= mount_fstype=
+inspect_mount() {
+  mount_id=; mount_source=; mount_fstype=
+  if mountpoint -q "$1" 2>/dev/null; then
+    mount_id=$(findmnt -rn -M "$1" -o ID 2>/dev/null || true)
+    mount_source=$(findmnt -rn -M "$1" -o SOURCE 2>/dev/null || true)
+    mount_fstype=$(findmnt -rn -M "$1" -o FSTYPE 2>/dev/null || true)
+    [ -n "$mount_id" ] && [ -n "$mount_source" ] && [ -n "$mount_fstype" ] || return 1
+    [ "$mount_id" = "$(findmnt -rn -M "$1" -o ID 2>/dev/null)" ] || return 1
+  fi
+}
+owned_mount() {
+  inspect_mount "$1" || die "mount identity is unstable: $1"
+  [ -z "$mount_id" ] || { [ "$mount_source" = xymediavault ] && { [ "$mount_fstype" = fuse.xymediavault ] || [ "$mount_fstype" = fuse ]; }; } || die "refusing foreign or unknown mount at $1"
+}
+valid_path() {
+  PATH_TO_CHECK=$1 python3 - <<'PY'
+import os, pathlib
+p = pathlib.Path(os.environ['PATH_TO_CHECK'])
+if not p.is_absolute() or str(p) == '/' or any(ord(c) < 32 or not c.isprintable() for c in str(p)):
+    raise SystemExit(1)
+if not p.is_dir(): raise SystemExit(1)
+cur = pathlib.Path(p.root)
+for part in p.parts[1:]:
+    cur /= part
+    if cur.is_symlink(): raise SystemExit(1)
+print(p.resolve(strict=True))
+PY
+}
+if [ "$action" = configure ]; then
+  new_path=$(valid_path "$path_arg") || die '目标路径必须是存在的、非根、绝对且不含符号链接的目录'
+  inspect_mount "$new_path" || die '无法稳定识别目标路径挂载状态'
+  if [ -n "$mount_id" ]; then owned_mount "$new_path"; else [ -z "$(find "$new_path" -mindepth 1 -maxdepth 1 -print -quit)" ] || die '目标目录必须为空'; fi
+else
+  if [ -n "$old_path" ]; then new_path=$(valid_path "$old_path") || die '已配置的 FUSE 主机路径无效'; else new_path=; fi
+fi
+if [ -n "$old_path" ]; then
+  old_path=$(valid_path "$old_path" 2>/dev/null) || die '已配置的 FUSE 主机路径无效'
+elif [ "$old_enabled" = true ]; then
+  die 'FUSE 已启用但未配置主机路径'
+fi
+if [ "$action" != disable ] && [ -z "$new_path" ]; then die '未配置 FUSE 主机路径'; fi
+
+compose_check_env=${new_path:-$old_path}
+if [ "$action" = disable ] || [ -z "$compose_check_env" ]; then
+  docker compose --project-directory "$install_dir" --env-file "$install_dir/.env" -f "$install_dir/compose.yaml" config -q || die 'compose configuration is invalid'
+else
+  XYMEDIA_FUSE_HOST_PATH=$compose_check_env docker compose --project-directory "$install_dir" --env-file "$install_dir/.env" -f "$install_dir/compose.yaml" -f "$install_dir/compose.fuse.yaml" config -q || die 'compose configuration is invalid'
+fi
+
+lock_dir=$install_dir/.install.lock
+mkdir "$lock_dir" 2>/dev/null || die '已有安装或 FUSE 维护正在进行'
+umask 077
+tmp_parent=${TMPDIR:-/tmp}
+ [ -d "$tmp_parent" ] && [ ! -L "$tmp_parent" ] || die 'TMPDIR must be an existing non-symlink directory'
+if [ "$(id -u)" -eq 0 ]; then
+  [ "$(stat -c '%u' "$tmp_parent")" -eq 0 ] || die 'TMPDIR must be owned by root when running as root'
+  [ $(( $(stat -c '%a' "$tmp_parent") & 022 )) -eq 0 ] || [ $(( $(stat -c '%a' "$tmp_parent") & 1000 )) -ne 0 ] || die 'TMPDIR must not be group/world writable unless sticky'
+fi
+private_tmp=$(mktemp -d "$tmp_parent/xymedia-fuse.XXXXXX") || { rmdir "$lock_dir" 2>/dev/null || true; die 'cannot create private temporary directory'; }
+chmod 700 "$private_tmp"
+log_file=$(mktemp "$private_tmp/remount.log.XXXXXX") || { rm -rf "$private_tmp"; rmdir "$lock_dir" 2>/dev/null || true; die 'cannot create private log'; }
+chmod 600 "$log_file"
+env_snapshot=$(mktemp "$private_tmp/env.snapshot.XXXXXX") || { rm -rf "$private_tmp"; rmdir "$lock_dir" 2>/dev/null || true; die 'cannot create private environment snapshot'; }
+config_snapshot=$(mktemp "$private_tmp/config.snapshot.XXXXXX") || { rm -rf "$private_tmp"; rmdir "$lock_dir" 2>/dev/null || true; die 'cannot create private config snapshot'; }
+cp "$install_dir/.env" "$env_snapshot"; cp "$install_dir/config.yaml" "$config_snapshot"
+LOG_FILE=$log_file
+cleanup() { status=$?; rm -rf "$private_tmp"; rmdir "$lock_dir" 2>/dev/null || true; exit "$status"; }
+trap cleanup EXIT INT TERM
+
+compose() { docker compose --project-directory "$install_dir" --env-file "$install_dir/.env" -f "$install_dir/compose.yaml" "$@"; }
+compose_old() { if [ "$old_enabled" = true ]; then compose -f "$install_dir/compose.fuse.yaml" "$@"; else compose "$@"; fi; }
+restore_old() {
+  cp "$env_snapshot" "$install_dir/.env"; cp "$config_snapshot" "$install_dir/config.yaml"
+  compose_old up -d app >/dev/null 2>&1 || true
+}
+fail_restore() { log "operation failed: $*"; restore_old; die "$*; configuration and app recovery attempted (log: $log_file)"; }
+if [ "$action" = disable ]; then enabled=false; else enabled=true; fi
+inspect_mount "${old_path:-$new_path}" || fail_restore 'old mount identity is unstable'
+old_mount_id=$mount_id; old_mount_source=$mount_source; old_mount_fstype=$mount_fstype
+if [ -n "$old_mount_id" ]; then owned_mount "${old_path:-$new_path}"; fi
+compose_old stop app >/dev/null 2>&1 || fail_restore 'failed to stop app'
+if [ -n "$old_mount_id" ]; then
+  inspect_mount "${old_path:-$new_path}" || fail_restore 'mount changed before unmount'
+  [ "$mount_id" = "$old_mount_id" ] && [ "$mount_source" = "$old_mount_source" ] && [ "$mount_fstype" = "$old_mount_fstype" ] || fail_restore 'mount identity changed before unmount'
+  if command -v fusermount3 >/dev/null 2>&1; then fusermount3 -u "${old_path:-$new_path}" || fail_restore 'unable to unmount owned FUSE mount'
+  elif command -v fusermount >/dev/null 2>&1; then fusermount -u "${old_path:-$new_path}" || fail_restore 'unable to unmount owned FUSE mount'
+  else umount "${old_path:-$new_path}" || fail_restore 'fusermount is required to unmount FUSE safely'; fi
+  inspect_mount "${old_path:-$new_path}" || fail_restore 'mount identity is unstable after unmount'
+  [ -z "$mount_id" ] || fail_restore 'FUSE path is still mounted'
+fi
+env_tmp=$(mktemp "$private_tmp/env.write.XXXXXX") || fail_restore 'cannot create private environment write file'
+config_tmp=$(mktemp "$private_tmp/config.write.XXXXXX") || fail_restore 'cannot create private config write file'
+chmod 600 "$env_tmp" "$config_tmp"
+if ! FUSE_ENABLED=$enabled FUSE_PATH=${new_path:-${old_path:-}} python3 - "$install_dir/.env" "$install_dir/config.yaml" "$env_tmp" "$config_tmp" <<'PY'
+import os, pathlib
+import stat, sys
+env = pathlib.Path(sys.argv[1]); config = pathlib.Path(sys.argv[2])
+env_tmp = pathlib.Path(sys.argv[3]); config_tmp = pathlib.Path(sys.argv[4])
+values = {'XYMEDIA_FUSE_ENABLED': os.environ['FUSE_ENABLED'], 'XYMEDIA_FUSE_HOST_PATH': os.environ['FUSE_PATH']}
+lines = env.read_text().splitlines(); seen=set(); out=[]
+for line in lines:
+    key=line.split('=',1)[0] if '=' in line else ''
+    if key in values: out.append(key+'='+values[key]); seen.add(key)
+    else: out.append(line)
+out += [k+'='+v for k,v in values.items() if k not in seen]
+if env.is_symlink() or config.is_symlink(): raise SystemExit('protected config file is a symlink')
+if not stat.S_ISREG(env.stat().st_mode) or not stat.S_ISREG(config.stat().st_mode): raise SystemExit('protected config file is not regular')
+env_tmp.write_text('\n'.join(out)+'\n'); os.chmod(env_tmp, 0o600); os.replace(env_tmp, env)
+text=config.read_text(); import re
+text=re.sub(r'(?m)^(  auto_mount:)\s*.*$', r'\1 '+('true' if values['XYMEDIA_FUSE_ENABLED']=='true' else 'false'), text)
+text=re.sub(r'(?m)^(  mount_path:)\s*.*$', r'\1 /mnt/xymediavault', text)
+config_tmp.write_text(text); os.chmod(config_tmp, 0o600); os.replace(config_tmp, config)
+PY
+then
+  fail_restore 'failed to update environment or config'
+fi
+if [ "$enabled" = true ]; then compose -f "$install_dir/compose.fuse.yaml" up -d app >/dev/null; else compose up -d app >/dev/null; fi
+attempt=0
+while [ "$attempt" -lt 60 ]; do
+  attempt=$((attempt+1))
+  if curl -fsS --max-time 5 "http://127.0.0.1:${XYMEDIA_API_PORT:-18080}/api/health" >/dev/null 2>&1; then
+    if [ "$enabled" = false ]; then log 'FUSE disabled and base app is healthy'; exit 0; fi
+    inspect_mount "$new_path" || fail_restore 'mount identity is unstable after start'
+    [ "$mount_source" = xymediavault ] && { [ "$mount_fstype" = fuse.xymediavault ] || [ "$mount_fstype" = fuse ]; } && log "FUSE mounted: $new_path" && exit 0
+  fi
+  sleep 2
+done
+fail_restore 'app health or FUSE mount timed out'