feat: DB backend and API implemementation

development-system/public/booking/booking.css

@@ -159,6 +159,15 @@
   font-style: normal;
   font-weight: 700;
 }
+.sufw-booking__slot span {
+  display: grid;
+  gap: 0.15rem;
+}
+.sufw-booking__slot small {
+  color: var(--sufw-booking-muted);
+  font-size: 0.875rem;
+  font-weight: 400;
+}
 .sufw-booking__slot:disabled {
   border-color: #777;
   background: #eee;
@@ -257,6 +266,24 @@
   background: #fff1f1;
   color: #6c0808;
 }
+.sufw-booking__conditional {
+  display: grid;
+  gap: 0.8rem;
+  margin: 0;
+  padding: 1rem;
+  border: 1px solid var(--sufw-booking-line);
+}
+.sufw-booking__conditional legend {
+  padding: 0 0.25rem;
+  font-weight: 700;
+}
+.sufw-booking__load-error {
+  margin: 1rem 0;
+  padding: 1rem;
+  border-left: 4px solid #a31111;
+  background: #fff1f1;
+  color: #6c0808;
+}
 .sufw-booking__form-errors ul {
   margin: 0;
   padding-left: 1.25rem;