fix: 搜索功能修复 - debounce函数定义顺序

- debounce函数在使用前必须先定义
- 之前定义在代码末尾，导致搜索事件绑定失败
- 现移到代码开头，确保正确执行

xian_favor/api.py

@@ -1090,6 +1090,17 @@ INDEX_TEMPLATE = '''
 <script>
 const API_BASE = '/api';
 let currentFilter = { type: '', status: '' };
+let currentPage = 1;
+const pageSize = 20;
+
+// 工具函数 - 必须先定义
+function debounce(fn, delay) {
+    let timer;
+    return function(...args) {
+        clearTimeout(timer);
+        timer = setTimeout(() => fn.apply(this, args), delay);
+    };
+}
 
 // 初始化
 document.addEventListener('DOMContentLoaded', async () => {
@@ -2196,14 +2207,6 @@ async function sendItemEmail() {
     }
 }
 
-function debounce(fn, delay) {
-    let timer;
-    return function(...args) {
-        clearTimeout(timer);
-        timer = setTimeout(() => fn.apply(this, args), delay);
-    };
-}
-
 // ============ 提醒功能 ============
 
 let reminderData = null;