feat!: add telegram auth and async refactor

- Removed "/schedule/update-download-url" endpoint, this mechanism was replaced by Yandex Cloud FaaS. Ура :)
- Improved schedule caching mechanism.
- Added Telegram WebApp authentication support.
- Reworked endpoints responses and errors mechanism.
- Refactored application state management.
- Make synchronous database operations, middlewares and extractors to asynchronous.
- Made user password field optional to support multiple auth methods.
- Renamed users table column "version" to "android_version" and made it nullable.

src/routes/schedule/mod.rs

@@ -5,7 +5,6 @@ mod schedule;
 mod schema;
 mod teacher;
 mod teacher_names;
-mod update_download_url;
 
 pub use cache_status::*;
 pub use group::*;
@@ -13,4 +12,3 @@ pub use group_names::*;
 pub use schedule::*;
 pub use teacher::*;
 pub use teacher_names::*;
-pub use update_download_url::*;