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/locale/ckb.cjs

@@ -0,0 +1,28 @@
+"use strict";
+exports.ckb = void 0;
+var _index = require("./ckb/_lib/formatDistance.cjs");
+var _index2 = require("./ckb/_lib/formatLong.cjs");
+var _index3 = require("./ckb/_lib/formatRelative.cjs");
+var _index4 = require("./ckb/_lib/localize.cjs");
+var _index5 = require("./ckb/_lib/match.cjs");
+
+/**
+ * @type {Locale}
+ * @category Locales
+ * @summary Central Kurdish locale.
+ * @language Central Kurdish
+ * @iso-639-2 kur
+ * @author Revan Sarbast [@Revan99]{@link https://github.com/Revan99}
+ */
+const ckb = (exports.ckb = {
+  code: "ckb",
+  formatDistance: _index.formatDistance,
+  formatLong: _index2.formatLong,
+  formatRelative: _index3.formatRelative,
+  localize: _index4.localize,
+  match: _index5.match,
+  options: {
+    weekStartsOn: 0 /* Sunday */,
+    firstWeekContainsDate: 1,
+  },
+});