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/state/env/yandex_cloud.rs

@@ -0,0 +1,16 @@
+use std::env;
+
+#[derive(Clone)]
+pub struct YandexCloudEnvData {
+    pub api_key: String,
+    pub func_id: String,
+}
+
+impl Default for YandexCloudEnvData {
+    fn default() -> Self {
+        Self {
+            api_key: env::var("YANDEX_CLOUD_API_KEY").expect("YANDEX_CLOUD_API_KEY must be set"),
+            func_id: env::var("YANDEX_CLOUD_FUNC_ID").expect("YANDEX_CLOUD_FUNC_ID must be set"),
+        }
+    }
+}