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/tapable/lib/index.js

@@ -0,0 +1,19 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+module.exports.AsyncParallelBailHook = require("./AsyncParallelBailHook");
+module.exports.AsyncParallelHook = require("./AsyncParallelHook");
+module.exports.AsyncSeriesBailHook = require("./AsyncSeriesBailHook");
+module.exports.AsyncSeriesHook = require("./AsyncSeriesHook");
+module.exports.AsyncSeriesLoopHook = require("./AsyncSeriesLoopHook");
+module.exports.AsyncSeriesWaterfallHook = require("./AsyncSeriesWaterfallHook");
+module.exports.HookMap = require("./HookMap");
+module.exports.MultiHook = require("./MultiHook");
+module.exports.SyncBailHook = require("./SyncBailHook");
+module.exports.SyncHook = require("./SyncHook");
+module.exports.SyncLoopHook = require("./SyncLoopHook");
+module.exports.SyncWaterfallHook = require("./SyncWaterfallHook");
+module.exports.__esModule = true;