fix: 菜单按钮 url 用 entire_url 生成绝对路径，避免前端 absurl 相对路径拼接错误

agent_menus.dspy 按钮 url 原用相对路径(/pipeline_core/api/...)，前端 absurl 对
以 / 开头的 url 拼接产生 /pipeline_core/api//pipeline-sdlc/... 双斜杠错误。
改用 entire_url() 生成绝对 URL(与 agent/index.ui 的 ability_menu 一致)。

wwwroot/api/agent_menus.dspy

@@ -49,7 +49,7 @@ buttons.append({
     "options": {"label": "🗂 工作空间", "css": "small", "id": "menu_btn_ws"},
     "binds": [{
         "wid": "self", "event": "click", "actiontype": "urlwidget",
-        "target": "self", "options": {"url": "/pipeline-sdlc/api/workspace_popup.dspy"},
+        "target": "self", "options": {"url": entire_url("/pipeline-sdlc/api/workspace_popup.dspy")},
     }],
 })
 
@@ -61,7 +61,7 @@ for i, m in enumerate(menus):
     width = str(m.get("width", "85%") or "85%")
     height = str(m.get("height", "80%") or "80%")
     query = _urlparse.urlencode({"url": url, "title": label, "width": width, "height": height})
-    open_url = "/pipeline_core/api/agent_menu_open.dspy?" + query
+    open_url = entire_url("/pipeline_core/api/agent_menu_open.dspy") + "?" + query
     buttons.append({
         "widgettype": "Button",
         "options": {"label": label, "css": "small", "id": "menu_btn_%d" % i},