Add update-vendor.sh symlink support, unify install.sh vendor flow

- update-vendor.sh now creates webui/vendor symlinks (htm.js)
- install.sh calls update-vendor.sh after package install
- Add vendor/.empty and webui/vendor/.empty as directory placeholders in git

daemon/handlers/nginx.py

@@ -23,7 +23,15 @@ from daemon.iface import (
 )
 from daemon.server import NotFoundError, refresh_state, registry
 from lib.acme import find_cert_dir
-from lib.common import ensure_dirs, load_json, run, run_proc, save_json
+from lib.common import (
+    _APPLY_HASH_KEY,
+    config_hash,
+    ensure_dirs,
+    load_json,
+    run,
+    run_proc,
+    save_json,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -300,7 +308,8 @@ def get_config(_request: Any, _body: Any) -> dict[str, Any]:
     ng = _get_nginx_state()
     if ng:
         return ng.get("config", {})
-    return _get_config()
+    cfg = _get_config()
+    return {k: v for k, v in cfg.items() if k != _APPLY_HASH_KEY}
 
 
 @registry.register(POST_NGINX_CONFIG)
@@ -507,6 +516,9 @@ def apply(_request: Any, _body: Any) -> dict[str, Any]:
     if not ok:
         raise RuntimeError(f"nginx config test failed: {msg}")
     _reload_nginx()
+    cfg_after = _get_config()
+    cfg_after[_APPLY_HASH_KEY] = config_hash(cfg_after)
+    _save_config(cfg_after)
     refresh_state(["nginx"])
     return {"applied": True}