fix: 修复提示词模板识别’{{}}‘的问题

app/api/prompts/prompts.ts

@@ -102,7 +102,7 @@ export function convertToUITemplate(template: PromptTemplate & { sso_users?: { u
     template_type: template.template_type as "LLM_Extraction" | "VLM_Extraction" | "Evaluation" | "Summary" | "Common",
     description: template.description || '',
     template_content: template.template_content,
-    variables: template.variables,
+    variables: template.variables || {}, // 如果variables为null，则使用空对象
     status: mapStatusToUI(template.status),
     version: template.version,
     created_by: template.created_by,

app/routes/prompts.new.tsx

@@ -212,14 +212,24 @@ const extractVariables = (content: string) => {
   const regex = /{([^{}]+)}/g;
   const variables: Record<string, string> = {};
   let match;
-  
+
   while ((match = regex.exec(content)) !== null) {
     const varName = match[1].trim();
-    if (varName && !variables[varName]) {
+    // 过滤掉无效的变量名：
+    // 1. 不能为空
+    // 2. 不能包含冒号（避免匹配 JSON 对象）
+    // 3. 不能包含引号（避免匹配 JSON 字符串）
+    // 4. 只允许字母、数字、下划线、中文
+    if (varName &&
+        !variables[varName] &&
+        !varName.includes(':') &&
+        !varName.includes('"') &&
+        !varName.includes("'") &&
+        /^[\w\u4e00-\u9fa5]+$/.test(varName)) {
       variables[varName] = varName;
     }
   }
-  
+
   return variables;
 };
 
@@ -269,10 +279,12 @@ export default function PromptsNew() {
       }));
     } else if (template) {
       // 否则使用模板数据
-      const variablesJson = typeof template.variables === 'string'
-        ? template.variables
-        : JSON.stringify(template.variables);
-        
+      // 处理变量数据，确保null和undefined转换为空对象
+      const variablesObj = template.variables || {};
+      const variablesJson = typeof variablesObj === 'string'
+        ? variablesObj
+        : JSON.stringify(variablesObj);
+
       const newFormData = {
         ...template,
         id: mode === "clone" ? "" : template.id,
@@ -280,17 +292,18 @@ export default function PromptsNew() {
         version: mode === "clone" ? "v1.0" : template.version,
         variables: variablesJson
       };
-      
+
       setFormData(newFormData);
-      
+
       try {
-        const vars = typeof template.variables === 'string' 
-          ? JSON.parse(template.variables) 
-          : template.variables;
-        
-        setExampleValues(vars);
+        const vars = typeof variablesObj === 'string'
+          ? JSON.parse(variablesObj)
+          : variablesObj;
+
+        setExampleValues(vars || {});
       } catch (e) {
         console.error("解析变量失败:", e);
+        setExampleValues({});
       }
       
       if (template.template_content) {