feat：webui支持更加优化的模型配置，优化多处UI体验，支持设置视觉和cache价格，修复多重表达不生效的问题，修复表情包路径错误

src/webui/config_schema.py

@@ -39,15 +39,12 @@ class ConfigSchemaGenerator:
         ui_parent = getattr(config_class, "__ui_parent__", "")
         ui_label = getattr(config_class, "__ui_label__", "")
         ui_icon = getattr(config_class, "__ui_icon__", "")
-        ui_merge_children = getattr(config_class, "__ui_merge_children__", [])
         if ui_parent:
             schema["uiParent"] = ui_parent
         if ui_label:
             schema["uiLabel"] = ui_label
         if ui_icon:
             schema["uiIcon"] = ui_icon
-        if ui_merge_children:
-            schema["uiMergeChildren"] = list(ui_merge_children)
 
         return schema