feat(web): 正式提取流程设计能力到AI目录下，做代码拆分

service-web/client/src/pages/ai/flow/node/LlmNode.tsx

@@ -0,0 +1,36 @@
+import type {NodeProps} from '@xyflow/react'
+import AmisNode from './AmisNode.tsx'
+
+const LlmNode = (props: NodeProps) => AmisNode(
+  props,
+  'normal',
+  '大模型节点',
+  '使用大模型对话',
+  [
+    {
+      type: 'select',
+      name: 'model',
+      label: '大模型',
+      required: true,
+      selectFirst: true,
+      options: [
+        {
+          label: 'Qwen3',
+          value: 'qwen3',
+        },
+        {
+          label: 'Deepseek',
+          value: 'deepseek',
+        },
+      ],
+    },
+    {
+      type: 'textarea',
+      name: 'systemPrompt',
+      label: '系统提示词',
+      required: true,
+    },
+  ],
+)
+
+export default LlmNode