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/rollup/dist/loadConfigFile.js

@@ -0,0 +1,29 @@
+/*
+  @license
+	Rollup.js v4.59.0
+	Sun, 22 Feb 2026 07:31:53 GMT - commit ae846957f109690a866cc3e4c073613c338d3476
+
+	https://github.com/rollup/rollup
+
+	Released under the MIT License.
+*/
+'use strict';
+
+Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
+
+require('node:fs/promises');
+require('node:path');
+require('node:process');
+require('node:url');
+require('./shared/rollup.js');
+require('./shared/parseAst.js');
+const loadConfigFile_js = require('./shared/loadConfigFile.js');
+require('path');
+require('./native.js');
+require('node:perf_hooks');
+require('./getLogFilter.js');
+
+
+
+exports.loadConfigFile = loadConfigFile_js.loadConfigFile;
+//# sourceMappingURL=loadConfigFile.js.map