created prototype of tasks for device and dialog, that shows all tasks for admin per each device

server/internal/dto/task.go

@@ -38,7 +38,7 @@ type CreateTaskDto struct {
 	Type models.DeviceTaskType `json:"type" binding:"required,oneof=start_stream stop_stream start_recording stop_recording update_config set_deep_sleep"`
 	// Pass raw JSON string as payload (e.g. {"sleepTimeout":5,"jitterMs":50,"recordingDurationSec":60})
 	// Keep it string to let device/server evolve freely.
-	Payload string `json:"payload" binding:"required"`
+	Payload string `json:"payload"`
 }
 
 // Device polls: single next task