修复种草图生成：以三合一主图为参考 img2img 生成，按颜色分配（每色优先、超出随机补足）；新增 BR/CA/DE/ES/IT/PL/SA 七国配置与提示词；删除验证用测试脚本

graph/llms/mock_backend.py

@@ -135,8 +135,12 @@ class MockBackend:
         related += history[:6]
         related += trending[4:8]
 
+        max_seeds = int(context.get("max_seeds") or 0)
         max_style = int(context.get("max_style_seeds", 10) or 10)
         max_related = int(context.get("max_related_seeds", 10) or 10)
+        if max_seeds > 0:
+            # 不再按类型分：总量均分到 style/related
+            max_style = max_related = (max_seeds + 1) // 2
         return {
             "style_seeds": _dedup_limit(style, max_style),
             "related_seeds": _dedup_limit(related, max_related),