refactor: разнести пакеты и обновить валидацию

protocol/state.go

@@ -0,0 +1,15 @@
+package protocol
+
+import "time"
+
+// ContentState is the current display state received from BVK.
+type ContentState struct {
+	Route     string    `json:"route"`
+	Text      string    `json:"str"`
+	Template  string    `json:"tpl_name"`
+	UpdatedAt time.Time `json:"updated_at,omitempty"`
+}
+
+func (s ContentState) IsZero() bool {
+	return s.Route == "" && s.Text == "" && s.Template == ""
+}