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/nl.cjs

@@ -0,0 +1,32 @@
+"use strict";
+exports.nl = void 0;
+var _index = require("./nl/_lib/formatDistance.cjs");
+var _index2 = require("./nl/_lib/formatLong.cjs");
+var _index3 = require("./nl/_lib/formatRelative.cjs");
+var _index4 = require("./nl/_lib/localize.cjs");
+var _index5 = require("./nl/_lib/match.cjs");
+
+/**
+ * @category Locales
+ * @summary Dutch locale.
+ * @language Dutch
+ * @iso-639-2 nld
+ * @author Jorik Tangelder [@jtangelder](https://github.com/jtangelder)
+ * @author Ruben Stolk [@rubenstolk](https://github.com/rubenstolk)
+ * @author Lode Vanhove [@bitcrumb](https://github.com/bitcrumb)
+ * @author Edo Rivai [@edorivai](https://github.com/edorivai)
+ * @author Niels Keurentjes [@curry684](https://github.com/curry684)
+ * @author Stefan Vermaas [@stefanvermaas](https://github.com/stefanvermaas)
+ */
+const nl = (exports.nl = {
+  code: "nl",
+  formatDistance: _index.formatDistance,
+  formatLong: _index2.formatLong,
+  formatRelative: _index3.formatRelative,
+  localize: _index4.localize,
+  match: _index5.match,
+  options: {
+    weekStartsOn: 1 /* Monday */,
+    firstWeekContainsDate: 4,
+  },
+});