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/da.cjs

@@ -0,0 +1,30 @@
+"use strict";
+exports.da = void 0;
+var _index = require("./da/_lib/formatDistance.cjs");
+var _index2 = require("./da/_lib/formatLong.cjs");
+var _index3 = require("./da/_lib/formatRelative.cjs");
+var _index4 = require("./da/_lib/localize.cjs");
+var _index5 = require("./da/_lib/match.cjs");
+
+/**
+ * @category Locales
+ * @summary Danish locale.
+ * @language Danish
+ * @iso-639-2 dan
+ * @author Mathias Wøbbe [@MathiasKandelborg](https://github.com/MathiasKandelborg)
+ * @author Anders B. Hansen [@Andersbiha](https://github.com/Andersbiha)
+ * @author [@kgram](https://github.com/kgram)
+ * @author [@stefanbugge](https://github.com/stefanbugge)
+ */
+const da = (exports.da = {
+  code: "da",
+  formatDistance: _index.formatDistance,
+  formatLong: _index2.formatLong,
+  formatRelative: _index3.formatRelative,
+  localize: _index4.localize,
+  match: _index5.match,
+  options: {
+    weekStartsOn: 1 /* Monday */,
+    firstWeekContainsDate: 4,
+  },
+});