更新runway 2api风控

backend/internal/provider/grok/video.go

@@ -65,6 +65,13 @@ func (c *Client) GenerateVideo(ctx context.Context, token, prompt, aspectRatio,
 		return nil, nil, err
 	}
 
+	// Self-heal the x-statsig-id anti-bot challenge for THIS session before the
+	// gated submit. Without it the header falls back to the static defaults,
+	// which go stale on a new grok web build and make conversations/new answer
+	// 403 (anti-bot). Fetch via the proxy client so the derived seed matches the
+	// submit's egress IP. Failure is non-fatal (statsigID then uses defaults).
+	c.ensureChallenge(ctx, submitClient, token)
+
 	// Image-to-video: upload each reference frame and collect its asset URL.
 	var imageRefs []string
 	for _, f := range frames {