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/getDaysInYear.cjs

@@ -0,0 +1,32 @@
+"use strict";
+exports.getDaysInYear = getDaysInYear;
+var _index = require("./isLeapYear.cjs");
+var _index2 = require("./toDate.cjs");
+
+/**
+ * The {@link getDaysInYear} function options.
+ */
+
+/**
+ * @name getDaysInYear
+ * @category Year Helpers
+ * @summary Get the number of days in a year of the given date.
+ *
+ * @description
+ * Get the number of days in a year of the given date.
+ *
+ * @param date - The given date
+ * @param options - An object with options
+ *
+ * @returns The number of days in a year
+ *
+ * @example
+ * // How many days are in 2012?
+ * const result = getDaysInYear(new Date(2012, 0, 1))
+ * //=> 366
+ */
+function getDaysInYear(date, options) {
+  const _date = (0, _index2.toDate)(date, options?.in);
+  if (Number.isNaN(+_date)) return NaN;
+  return (0, _index.isLeapYear)(_date) ? 366 : 365;
+}