feat: 优化工作流参数编辑与告警交互

- 新增 ParamTokenEditor，支持参数选择插入、token 高亮、整段删除与光标避让

- 参数候选改为动态监测，未映射参数可选择并在下拉与输入框顶部告警

- 接入知识库/搜索引擎/LLM/动态代码/HTTP Body 及 SQL、查询数据自定义节点

- 优化 Http 节点布局并补充参数解析工具与单测

easyflow-ui-admin/packages/tinyflow-ui/src/components/nodes/LLMNode.svelte

@@ -1,8 +1,8 @@
 <script lang="ts">
   import NodeWrapper from '../core/NodeWrapper.svelte';
-  import {type NodeProps, useSvelteFlow} from '@xyflow/svelte';
+  import {type NodeProps, useNodesData, useSvelteFlow} from '@xyflow/svelte';
   import {Button, FloatingTrigger, Heading, Select} from '../base';
-  import {MenuButton, Textarea} from '../base/index.js';
+  import {MenuButton} from '../base/index.js';
   import RefParameterList from '../core/RefParameterList.svelte';
   import {getCurrentNodeId} from '#components/utils/NodeUtils';
   import {useAddParameter} from '../utils/useAddParameter.svelte';
@@ -10,6 +10,7 @@
   import {onMount} from 'svelte';
   import OutputDefList from '../core/OutputDefList.svelte';
   import type {SelectItem} from '#types';
+  import ParamTokenEditor from '../core/ParamTokenEditor.svelte';
 
   const { data, ...rest }: {
         data: NodeProps['data'],
@@ -17,7 +18,11 @@
     } = $props();
 
     const currentNodeId = getCurrentNodeId();
+    let currentNode = useNodesData(currentNodeId);
     const { addParameter } = useAddParameter();
+    const editorParameters = $derived.by(() => {
+        return (currentNode?.current?.data?.parameters as Array<any>) || data.parameters || [];
+    });
 
     const options = getOptions();
 
@@ -177,25 +182,29 @@
 
     <div class="setting-title">系统提示词</div>
     <div class="setting-item">
-        <Textarea rows={5}
+        <ParamTokenEditor
+            mode="textarea"
+            rows={5}
             placeholder="请输入系统提示词"
             style="width: 100%"
+            parameters={editorParameters}
             value={data.systemPrompt || ''}
             oninput={(e)=>{
                 updateNodeData(currentNodeId, {
                     systemPrompt: e.target.value
                 });
             }}
-
         />
     </div>
 
     <div class="setting-title">用户提示词</div>
     <div class="setting-item">
-        <Textarea
+        <ParamTokenEditor
+            mode="textarea"
             rows={5}
             placeholder="请输入用户提示词"
             style="width: 100%"
+            parameters={editorParameters}
             value={data.userPrompt || ''}
             oninput={(e)=>{
                 updateNodeData(currentNodeId, {
@@ -288,5 +297,3 @@
     }
 </style>
 
-
-