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/isSameISOWeek.d.ts

@@ -0,0 +1,36 @@
+import type { ContextOptions, DateArg } from "./types.js";
+/**
+ * The {@link isSameISOWeek} function options.
+ */
+export interface IsSameISOWeekOptions extends ContextOptions<Date> {}
+/**
+ * @name isSameISOWeek
+ * @category ISO Week Helpers
+ * @summary Are the given dates in the same ISO week (and year)?
+ *
+ * @description
+ * Are the given dates in the same ISO week (and 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 (and year)
+ *
+ * @example
+ * // Are 1 September 2014 and 7 September 2014 in the same ISO week?
+ * const result = isSameISOWeek(new Date(2014, 8, 1), new Date(2014, 8, 7))
+ * //=> true
+ *
+ * @example
+ * // Are 1 September 2014 and 1 September 2015 in the same ISO week?
+ * const result = isSameISOWeek(new Date(2014, 8, 1), new Date(2015, 8, 1))
+ * //=> false
+ */
+export declare function isSameISOWeek(
+  laterDate: DateArg<Date> & {},
+  earlierDate: DateArg<Date> & {},
+  options?: IsSameISOWeekOptions | undefined,
+): boolean;