Enhance configuration and routing for streaming features: update .env.example and appsettings.json to include new scheduler and streaming options, add streaming endpoint mapping in Program.cs, and integrate streaming services in DependencyInjection. Introduce segment path resolution in MediaPathResolver for asset management.

backend/src/TeleWave.Api/Program.cs

@@ -115,6 +115,7 @@ app.MapAdminUserEndpoints();
 app.MapMediaEndpoints();
 app.MapShowEndpoints();
 app.MapChannelEndpoints();
+app.MapStreamingEndpoints();
 
 // Раздача статики SPA из wwwroot + fallback на index.html для клиентских маршрутов.
 app.UseDefaultFiles();