refactor(nfcTest): 移除模拟扫描功能并改进NFC结果显示

- 删除开发调试用的模拟扫描按钮及相关逻辑
- 添加safe_stringify方法处理ArrayBuffer类型数据
- 改进NFC结果显示格式，包含原始数据和解析结果
- 调整样式增加卡片边距

@@ -13,10 +13,6 @@
       <nut-button v-if="isScanning" type="danger" size="large" @click="stopScan" style="margin-top: 40rpx;">
         停止扫描
       </nut-button>
-
-      <nut-button v-if="showMockButton" type="info" size="large" @click="mockScan" style="margin-top: 40rpx;">
-        模拟扫描 (开发调试)
-      </nut-button>
     </view>
 
     <view class="status-area">
@@ -52,11 +48,36 @@ const isScanning = ref(false);
 const status = ref('等待操作');
 const result = ref('');
 const error = ref('');
-const showMockButton = ref(false);
 const debugInfo = ref('');
 
 let nfcAdapter = null;
 
+const safe_stringify = (data) => {
+  try {
+    return JSON.stringify(
+      data,
+      (key, value) => {
+        if (value instanceof ArrayBuffer) {
+          return {
+            __type: 'ArrayBuffer',
+            hex: bufferToHex(value),
+          };
+        }
+        if (value && value.buffer instanceof ArrayBuffer) {
+          return {
+            __type: 'TypedArray',
+            hex: bufferToHex(value.buffer),
+          };
+        }
+        return value;
+      },
+      2
+    );
+  } catch (e) {
+    return String(data);
+  }
+};
+
 const startScan = async () => {
   error.value = '';
   result.value = '';
@@ -74,30 +95,21 @@ const startScan = async () => {
   const version = systemInfo && systemInfo.version ? systemInfo.version : '';
   debugInfo.value = `env: ${envType}\nplatform: ${platform}\nsystem: ${system}\nmodel: ${model}\nSDKVersion: ${SDKVersion}\nversion: ${version}`;
 
-  if (platform === 'devtools') {
-    showMockButton.value = true;
-  } else {
-    showMockButton.value = false;
-  }
-
   if (platform === 'ios') {
     error.value = 'iOS 端微信小程序通常不支持 NFC（该能力主要在 Android 可用）';
     status.value = '启动失败';
-    showMockButton.value = true;
     return;
   }
 
   if (!Taro.getNFCAdapter) {
     error.value = '当前环境不支持 NFC 接口';
     status.value = '启动失败';
-    showMockButton.value = true;
     return;
   }
 
   if (envType && Taro.ENV_TYPE && envType !== Taro.ENV_TYPE.WEAPP) {
     error.value = '当前不是微信小程序环境，无法使用 NFC';
     status.value = '启动失败';
-    showMockButton.value = true;
     return;
   }
 
@@ -130,11 +142,9 @@ const startScan = async () => {
         } else if (err.errCode === 13001) {
           error.value = '系统 NFC 开关未开启';
         } else if (err.errMsg && err.errMsg.includes('platform is not supported')) {
-          error.value = '开发者工具不支持 NFC，请使用真机调试或点击下方模拟按钮';
-          showMockButton.value = true;
+          error.value = '开发者工具不支持 NFC，请使用真机调试';
         } else {
           error.value = 'NFC 启动失败: ' + (err.errMsg || JSON.stringify(err));
-          showMockButton.value = true;
         }
         status.value = '启动失败';
       }
@@ -157,51 +167,9 @@ const startScan = async () => {
     debugInfo.value = `${debugInfo.value}\n\ngetNFCAdapter error:\n${e && (e.errMsg || e.message || JSON.stringify(e))}`;
     error.value = 'NFC 初始化失败（可能是设备/系统不支持，或不在可用环境）';
     status.value = '错误';
-    showMockButton.value = true;
   }
 };
 
-const mockScan = () => {
-    status.value = '模拟扫描成功';
-    error.value = '';
-
-    // 构造模拟数据
-    // 模拟一个包含 Text Record 的 NDEF 消息
-    const text = 'Hello NFC!';
-    const langCode = 'en';
-    const payload = new Uint8Array(1 + langCode.length + text.length);
-    payload[0] = langCode.length; // Status byte (simplified)
-    // 写入 lang code
-    for (let i = 0; i < langCode.length; i++) {
-        payload[1 + i] = langCode.charCodeAt(i);
-    }
-    // 写入 text
-    for (let i = 0; i < text.length; i++) {
-        payload[1 + langCode.length + i] = text.charCodeAt(i);
-    }
-
-    // 模拟 type 'T'
-    const type = new Uint8Array([84]); // 'T'
-
-    const mockRes = {
-        id: new Uint8Array([0x04, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0]).buffer,
-        techs: ['NFC-A', 'NDEF'],
-        messages: [
-            {
-                records: [
-                    {
-                        type: type.buffer,
-                        payload: payload.buffer,
-                        tnf: 1
-                    }
-                ]
-            }
-        ]
-    };
-
-    handleNfcMessage(mockRes);
-};
-
 const stopScan = () => {
   if (nfcAdapter) {
     nfcAdapter.stopDiscovery({
@@ -299,7 +267,7 @@ const handleNfcMessage = (res) => {
     content += '\n(无 NDEF 消息)\n';
   }
 
-  result.value = content;
+  result.value = `--- 原始数据 ---\n${safe_stringify(res)}\n\n--- 解析结果 ---\n${content}`;
 };
 
 onUnmounted(() => {
@@ -368,6 +336,7 @@ onUnmounted(() => {
     background: #fff;
     border-radius: 24rpx;
     padding: 40rpx;
+    margin: 10rpx auto;
     box-shadow: 0 4rpx 24rpx rgba(0, 0, 0, 0.05);
 
     .result-header {