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/tinyglobby/README.md

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+# tinyglobby
+
+[![npm version](https://img.shields.io/npm/v/tinyglobby.svg?maxAge=3600)](https://npmjs.com/package/tinyglobby)
+[![monthly downloads](https://img.shields.io/npm/dm/tinyglobby.svg?maxAge=3600)](https://npmjs.com/package/tinyglobby)
+
+A fast and minimal alternative to globby and fast-glob, meant to behave the same way.
+
+Both globby and fast-glob present some behavior no other globbing lib has,
+which makes it hard to manually replace with something smaller and better.
+
+This library uses only two subdependencies, compared to `globby`'s [23](https://npmgraph.js.org/?q=globby@14.1.0)
+and `fast-glob`'s [17](https://npmgraph.js.org/?q=fast-glob@3.3.3).
+
+## Usage
+
+```js
+import { glob, globSync } from 'tinyglobby';
+
+await glob(['files/*.ts', '!**/*.d.ts'], { cwd: 'src' });
+globSync('src/**/*.ts', { ignore: '**/*.d.ts' });
+```
+
+## Documentation
+
+Visit https://superchupu.dev/tinyglobby to read the full documentation.