fix: align video generation payloads

apps/api/internal/runner/limits.go

@@ -131,6 +131,11 @@ func estimateRequestTokens(body map[string]any) int {
 	if input := stringFromMap(body, "input"); input != "" {
 		text += input
 	}
+	for _, item := range contentItems(body["content"]) {
+		if stringFromAny(item["type"]) == "text" {
+			text += stringFromAny(item["text"])
+		}
+	}
 	if messages, ok := body["messages"].([]any); ok {
 		for _, raw := range messages {
 			message, _ := raw.(map[string]any)