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/cache_status.rs

@@ -7,17 +7,5 @@ use actix_web::{get, web};
 ))]
 #[get("/cache-status")]
 pub async fn cache_status(app_state: web::Data<AppState>) -> CacheStatus {
-    // Prevent thread lock
-    let has_schedule = app_state
-        .schedule
-        .lock()
-        .as_ref()
-        .map(|res| res.is_some())
-        .unwrap();
-
-    match has_schedule {
-        true => CacheStatus::from(&app_state),
-        false => CacheStatus::default(),
-    }
-    .into()
+    CacheStatus::from(&app_state).await.into()
 }