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/@babel/traverse/lib/path/inference/util.js

@@ -0,0 +1,28 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.createUnionType = createUnionType;
+var _t = require("@babel/types");
+const {
+  createFlowUnionType,
+  createTSUnionType,
+  createUnionTypeAnnotation,
+  isFlowType,
+  isTSType
+} = _t;
+function createUnionType(types) {
+  if (types.every(v => isFlowType(v))) {
+    if (createFlowUnionType) {
+      return createFlowUnionType(types);
+    }
+    return createUnionTypeAnnotation(types);
+  } else if (types.every(v => isTSType(v))) {
+    if (createTSUnionType) {
+      return createTSUnionType(types);
+    }
+  }
+}
+
+//# sourceMappingURL=util.js.map