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/getWeekOfMonth.js

@@ -0,0 +1,51 @@
+import { getDefaultOptions } from "./_lib/defaultOptions.js";
+import { getDate } from "./getDate.js";
+import { getDay } from "./getDay.js";
+import { startOfMonth } from "./startOfMonth.js";
+import { toDate } from "./toDate.js";
+
+/**
+ * The {@link getWeekOfMonth} function options.
+ */
+
+/**
+ * @name getWeekOfMonth
+ * @category Week Helpers
+ * @summary Get the week of the month of the given date.
+ *
+ * @description
+ * Get the week of the month of the given date.
+ *
+ * @param date - The given date
+ * @param options - An object with options.
+ *
+ * @returns The week of month
+ *
+ * @example
+ * // Which week of the month is 9 November 2017?
+ * const result = getWeekOfMonth(new Date(2017, 10, 9))
+ * //=> 2
+ */
+export function getWeekOfMonth(date, options) {
+  const defaultOptions = getDefaultOptions();
+  const weekStartsOn =
+    options?.weekStartsOn ??
+    options?.locale?.options?.weekStartsOn ??
+    defaultOptions.weekStartsOn ??
+    defaultOptions.locale?.options?.weekStartsOn ??
+    0;
+
+  const currentDayOfMonth = getDate(toDate(date, options?.in));
+  if (isNaN(currentDayOfMonth)) return NaN;
+
+  const startWeekDay = getDay(startOfMonth(date, options));
+
+  let lastDayOfFirstWeek = weekStartsOn - startWeekDay;
+  if (lastDayOfFirstWeek <= 0) lastDayOfFirstWeek += 7;
+
+  const remainingDaysAfterFirstWeek = currentDayOfMonth - lastDayOfFirstWeek;
+  return Math.ceil(remainingDaysAfterFirstWeek / 7) + 1;
+}
+
+// Fallback for modularized imports:
+export default getWeekOfMonth;