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/users/me.rs

@@ -1,10 +1,10 @@
 use crate::database::models::User;
-use crate::extractors::base::SyncExtractor;
-use actix_web::get;
+use crate::extractors::base::AsyncExtractor;
 use crate::routes::schema::user::UserResponse;
+use actix_web::get;
 
 #[utoipa::path(responses((status = OK, body = UserResponse)))]
 #[get("/me")]
-pub async fn me(user: SyncExtractor<User>) -> UserResponse {
+pub async fn me(user: AsyncExtractor<User>) -> UserResponse {
     user.into_inner().into()
 }