Added layout options for the public booking form. Fixes #16

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/backend/data.rs

@@ -6,6 +6,7 @@ use chrono::{Local, NaiveDate, NaiveTime, Weekday};
 use lazy_static::lazy_static;
 use crate::backend::banner::{is_stored_image_name, BannerOptions};
 use crate::backend::color::Colors;
+use crate::backend::layout::LayoutOptions;
 use regex::Regex;
 use rust_decimal::Decimal;
 use serde::{Deserialize, Serialize};
@@ -751,7 +752,10 @@ pub struct Appearance {
     pub logo: Option<String>,
     #[serde(default)]
     #[cfg_attr(feature = "ssr", sqlx(flatten))]
-    pub banner_options: BannerOptions
+    pub banner_options: BannerOptions,
+    #[serde(default)]
+    #[cfg_attr(feature = "ssr", sqlx(flatten))]
+    pub layout: LayoutOptions
 }
 
 impl Appearance {