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/schedule.rs

@@ -0,0 +1,17 @@
+use std::env;
+
+#[derive(Clone)]
+pub struct ScheduleEnvData {
+    pub url: Option<String>,
+    pub auto_update: bool,
+}
+
+impl Default for ScheduleEnvData {
+    fn default() -> Self {
+        Self {
+            url: env::var("SCHEDULE_INIT_URL").ok(),
+            auto_update: !env::var("SCHEDULE_DISABLE_AUTO_UPDATE")
+                .is_ok_and(|v| v.eq("1") || v.eq("true")),
+        }
+    }
+}