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/setISOWeekYear.d.ts

@@ -0,0 +1,39 @@
+import type { ContextOptions, DateArg } from "./types.js";
+/**
+ * The {@link setISOWeekYear} function options.
+ */
+export interface SetISOWeekYearOptions<DateType extends Date = Date>
+  extends ContextOptions<DateType> {}
+/**
+ * @name setISOWeekYear
+ * @category ISO Week-Numbering Year Helpers
+ * @summary Set the ISO week-numbering year to the given date.
+ *
+ * @description
+ * Set the ISO week-numbering year to the given date,
+ * saving the week number and the weekday number.
+ *
+ * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
+ *
+ * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows using extensions like [`UTCDate`](https://github.com/date-fns/utc).
+ * @typeParam ResultDate - The result `Date` type, it is the type returned from the context function if it is passed, or inferred from the arguments.
+ *
+ * @param date - The date to be changed
+ * @param weekYear - The ISO week-numbering year of the new date
+ * @param options - An object with options
+ *
+ * @returns The new date with the ISO week-numbering year set
+ *
+ * @example
+ * // Set ISO week-numbering year 2007 to 29 December 2008:
+ * const result = setISOWeekYear(new Date(2008, 11, 29), 2007)
+ * //=> Mon Jan 01 2007 00:00:00
+ */
+export declare function setISOWeekYear<
+  DateType extends Date,
+  ResultDate extends Date = DateType,
+>(
+  date: DateArg<DateType>,
+  weekYear: number,
+  options?: SetISOWeekYearOptions<ResultDate> | undefined,
+): ResultDate;