fix: 修复股票搜索功能

- 将u-input替换为原生input，解决事件参数问题
- 添加onStockInput方法正确处理input事件
- 添加调试日志便于排查问题

pages/detail/detail.vue

@@ -197,13 +197,12 @@
           <view class="form-item">
             <text class="form-label">{{ transactionType === 'sell' ? '选择持仓' : '股票代码' }}</text>
             <view class="relative">
-              <u-input 
+              <input 
                 v-model="transactionForm.stockCode"
+                class="stock-input"
                 :placeholder="transactionType === 'sell' ? '点击选择要卖出的持仓' : '请输入股票代码搜索'"
                 :disabled="transactionType === 'sell'"
-                :border="false"
-                :customStyle="{ backgroundColor: '#F9FAFB', borderRadius: '16rpx', height: '80rpx', padding: '0 20rpx', border: '2rpx solid #E5E7EB' }"
-                @input="transactionType === 'buy' ? searchStock($event) : () => {}"
+                @input="onStockInput"
                 @click="handleStockInputClick"
               />
               <!-- 搜索下拉列表 -->
@@ -351,7 +350,6 @@ const searchTimer = ref(null);
 
 const handleStockInputClick = () => {
   if (transactionType.value === 'sell') {
-    // 卖出时显示当前持仓列表
     searchResults.value = positions.value.map(pos => ({
       ticker: pos.stockCode,
       stockCode: pos.stockCode,
@@ -365,8 +363,14 @@ const handleStockInputClick = () => {
   }
 };
 
+const onStockInput = (e) => {
+  const keyword = e.detail.value;
+  console.log('🔍 股票输入:', keyword);
+  searchStock(keyword);
+};
+
 const searchStock = async (keyword) => {
-  // 防抖
+  console.log('🔍 searchStock 调用:', keyword);
   if (searchTimer.value) clearTimeout(searchTimer.value);
   if (!keyword || keyword.length < 1) {
     searchResults.value = [];
@@ -375,7 +379,9 @@ const searchStock = async (keyword) => {
 
   searchTimer.value = setTimeout(async () => {
     try {
+      console.log('📤 调用 api.ticker.search:', keyword);
       const res = await api.ticker.search(keyword);
+      console.log('📥 搜索结果:', res);
       if (res.code === 200) {
         searchResults.value = res.data;
       }
@@ -822,6 +828,18 @@ const deletePortfolio = async () => {
   margin-bottom: 12rpx;
 }
 
+.stock-input {
+  width: 100%;
+  height: 80rpx;
+  background-color: #F9FAFB;
+  border: 2rpx solid #E5E7EB;
+  border-radius: 16rpx;
+  padding: 0 20rpx;
+  font-size: 26rpx;
+  color: #1F2937;
+  box-sizing: border-box;
+}
+
 .form-select {
   width: 100%;
   height: 80rpx;