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/vk_id.rs

@@ -0,0 +1,19 @@
+use std::env;
+
+#[derive(Clone)]
+pub struct VkIdEnvData {
+    pub client_id: i32,
+    pub redirect_url: String,
+}
+
+impl Default for VkIdEnvData {
+    fn default() -> Self {
+        Self {
+            client_id: env::var("VK_ID_CLIENT_ID")
+                .expect("VK_ID_CLIENT_ID must be set")
+                .parse()
+                .expect("VK_ID_CLIENT_ID must be integer"),
+            redirect_url: env::var("VK_ID_REDIRECT_URI").expect("VK_ID_REDIRECT_URI must be set"),
+        }
+    }
+}