test(web): cover the plugin configuration section end to end

Three scenarios over the real wire: the cards this deployment's exposed
namespaces produce, one field edited down to the settings document with the
override badge that layering produces, and the reset that clears it back to
the composed default.

Every other settings golden gains the same nav entry and nothing else.

apps/web/tests/snapshots/plugin-config/section.expected.md

@@ -0,0 +1,34 @@
+- dialog "设置":
+  - navigation:
+    - text: 设置
+    - button "通用设置":
+      - img
+      - text: 通用设置
+    - button "模型":
+      - img
+      - text: 模型
+    - button "Agent 预设":
+      - img
+      - text: Agent 预设
+    - button "插件":
+      - img
+      - text: 插件
+  - button "打开配置文件"
+  - button "关闭":
+    - img
+    - text: 关闭
+  - heading "插件配置" [level=2]
+  - paragraph: 本部署所组装插件自己拥有的设置。你在这里设的值会覆盖组装默认值，并在下一次使用时生效。
+  - list:
+    - listitem:
+      - button "终端 限制 agent 运行的每一条命令。":
+        - img
+        - text: 终端 限制 agent 运行的每一条命令。
+    - listitem:
+      - button "Agent 循环 Agent 如何派发工具调用。":
+        - img
+        - text: Agent 循环 Agent 如何派发工具调用。
+    - listitem:
+      - button "网页搜索 DeepSeek 搜索提供方。":
+        - img
+        - text: 网页搜索 DeepSeek 搜索提供方。