Fix curl-pipe-bash install menu on Linux.

Avoid unbound BASH_SOURCE under set -u, attach stdin to /dev/tty for interactive prompts, and handle empty menu input without looping.

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

scripts/navctl.py

@@ -41,12 +41,25 @@ def _fail(msg: str) -> None:
 
 
 def _pause() -> None:
+    if not sys.stdin.isatty():
+        return
     try:
         input("\n按回车返回菜单...")
     except (EOFError, KeyboardInterrupt):
         print()
 
 
+def _require_tty(action: str) -> None:
+    if sys.stdin.isatty():
+        return
+    print(f"[FAIL] 当前环境无法交互式{action}（stdin 不是终端）", file=sys.stderr)
+    print("请使用以下方式之一：", file=sys.stderr)
+    print("  bash scripts/install.sh", file=sys.stderr)
+    print("  python3 scripts/navctl.py install -y", file=sys.stderr)
+    print("  curl -fsSL .../install.sh | bash -s -- install -y", file=sys.stderr)
+    sys.exit(1)
+
+
 def prompt_value(label: str, default: str) -> str:
     try:
         raw = input(f"{label} [{default}]: ").strip()
@@ -118,6 +131,8 @@ def run_deploy(project_dir: Path, py_exe: str) -> None:
 
 
 def action_install(*, repo: str = "", dest: str = "", yes: bool = False) -> None:
+    if not yes:
+        _require_tty("安装")
     print()
     print("=" * 50)
     print("  一键部署安装")
@@ -168,6 +183,7 @@ def action_update(*, dest: str = "") -> None:
 
 
 def action_uninstall(*, dest: str = "") -> None:
+    _require_tty("卸载")
     print()
     print("=" * 50)
     print("  一键卸载")
@@ -249,6 +265,7 @@ def render_menu(project_dir: Path | None) -> None:
 
 
 def interactive_menu() -> None:
+    _require_tty("打开菜单")
     print(f"LocalNav 部署管理 · {platform.system()} {platform.release()}")
     while True:
         project_dir = resolve_project_dir()
@@ -259,6 +276,11 @@ def interactive_menu() -> None:
             print("\n再见。")
             return
 
+        if not choice:
+            _warn("请输入 0-3")
+            _pause()
+            continue
+
         if choice == "1":
             try:
                 action_install()