refactor: resolve hotel name directly from HOTEL_NAME env

resolveHotelName() now returns env.HOTEL_NAME directly — the single source
of truth. The CMS hotel_name site setting and its DEFAULTS entry are removed
as dead code since they no longer influence the displayed name.

Call sites are unchanged (still await resolveHotelName()); only the lookup
behind it is gone, so the public site always shows the configured env name
with no DB round-trip and no preset.

src/app/admin/settings/cms-settings-config.ts

@@ -44,13 +44,6 @@ export const SETTINGS_GROUPS: SettingsGroup[] = [
 		icon: "building",
 		description: "Name, branding and defaults shown across the site.",
 		fields: [
-			{
-				key: "hotel_name",
-				label: "Hotel name",
-				type: "text",
-				placeholder: "Epicnabbo",
-				defaultValue: "",
-			},
 			{
 				key: "cms_logo",
 				label: "Logo URL",