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/fr-CA.cjs

@@ -0,0 +1,32 @@
+"use strict";
+exports.frCA = void 0;
+var _index = require("./fr/_lib/formatDistance.cjs");
+var _index2 = require("./fr/_lib/formatRelative.cjs");
+var _index3 = require("./fr/_lib/localize.cjs");
+var _index4 = require("./fr/_lib/match.cjs");
+
+var _index5 = require("./fr-CA/_lib/formatLong.cjs"); // Same as fr
+// Unique for fr-CA
+/**
+ * @category Locales
+ * @summary French locale (Canada).
+ * @language French
+ * @iso-639-2 fra
+ * @author Jean Dupouy [@izeau](https://github.com/izeau)
+ * @author François B [@fbonzon](https://github.com/fbonzon)
+ * @author Gabriele Petrioli [@gpetrioli](https://github.com/gpetrioli)
+ */
+const frCA = (exports.frCA = {
+  code: "fr-CA",
+  formatDistance: _index.formatDistance,
+  formatLong: _index5.formatLong,
+  formatRelative: _index2.formatRelative,
+  localize: _index3.localize,
+  match: _index4.match,
+
+  // Unique for fr-CA
+  options: {
+    weekStartsOn: 0 /* Sunday */,
+    firstWeekContainsDate: 1,
+  },
+});