Add OpenAPI docs, frontend, migrations, and API updates

- OpenAPI: add missing endpoints (add-from-url, subscriptions, public availability)
- OpenAPI: CalendarSubscription schema, Subscriptions tag
- Frontend app
- Migrations: count_for_availability, subscriptions_sync, user_preferences, calendar_settings
- Config, rate limit, auth, calendar, booking, ICS, availability, user service updates

Made-with: Cursor

frontend/node_modules/date-fns/isTomorrow.js

@@ -0,0 +1,37 @@
+import { addDays } from "./addDays.js";
+import { constructNow } from "./constructNow.js";
+import { isSameDay } from "./isSameDay.js";
+
+/**
+ * The {@link isTomorrow} function options.
+ */
+
+/**
+ * @name isTomorrow
+ * @category Day Helpers
+ * @summary Is the given date tomorrow?
+ * @pure false
+ *
+ * @description
+ * Is the given date tomorrow?
+ *
+ * @param date - The date to check
+ * @param options - An object with options
+ *
+ * @returns The date is tomorrow
+ *
+ * @example
+ * // If today is 6 October 2014, is 7 October 14:00:00 tomorrow?
+ * const result = isTomorrow(new Date(2014, 9, 7, 14, 0))
+ * //=> true
+ */
+export function isTomorrow(date, options) {
+  return isSameDay(
+    date,
+    addDays(constructNow(options?.in || date), 1),
+    options,
+  );
+}
+
+// Fallback for modularized imports:
+export default isTomorrow;