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/isSameISOWeekYear.js

@@ -0,0 +1,40 @@
+import { startOfISOWeekYear } from "./startOfISOWeekYear.js";
+
+import { normalizeDates } from "./_lib/normalizeDates.js";
+
+/**
+ * The {@link isSameISOWeekYear} function options.
+ */
+
+/**
+ * @name isSameISOWeekYear
+ * @category ISO Week-Numbering Year Helpers
+ * @summary Are the given dates in the same ISO week-numbering year?
+ *
+ * @description
+ * Are the given dates in the same ISO week-numbering year?
+ *
+ * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
+ *
+ * @param laterDate - The first date to check
+ * @param earlierDate - The second date to check
+ * @param options - An object with options
+ *
+ * @returns The dates are in the same ISO week-numbering year
+ *
+ * @example
+ * // Are 29 December 2003 and 2 January 2005 in the same ISO week-numbering year?
+ * const result = isSameISOWeekYear(new Date(2003, 11, 29), new Date(2005, 0, 2))
+ * //=> true
+ */
+export function isSameISOWeekYear(laterDate, earlierDate, options) {
+  const [laterDate_, earlierDate_] = normalizeDates(
+    options?.in,
+    laterDate,
+    earlierDate,
+  );
+  return +startOfISOWeekYear(laterDate_) === +startOfISOWeekYear(earlierDate_);
+}
+
+// Fallback for modularized imports:
+export default isSameISOWeekYear;