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

webui/server.py

@@ -26,6 +26,7 @@ from webui.api.firewall import bp as firewall_bp
 from webui.api.logs import bp as logs_bp
 from webui.api.network import bp as network_bp
 from webui.api.proxy import bp as proxy_bp
+from webui.api.status import bp as status_bp
 from webui.api.wireguard import bp as wireguard_bp
 
 # ---------------------------------------------------------------------------
@@ -94,6 +95,7 @@ app.register_blueprint(proxy_bp, url_prefix="/api/proxy")
 app.register_blueprint(certs_bp, url_prefix="/api/certs")
 app.register_blueprint(wireguard_bp, url_prefix="/api/wireguard")
 app.register_blueprint(logs_bp, url_prefix="/api/logs")
+app.register_blueprint(status_bp, url_prefix="/api/status")
 
 BLUEPRINTS = [
     ("firewall", firewall_bp),
@@ -103,6 +105,7 @@ BLUEPRINTS = [
     ("certs", certs_bp),
     ("wireguard", wireguard_bp),
     ("logs", logs_bp),
+    ("status", status_bp),
 ]
 
 for name, _ in BLUEPRINTS: