style(mining-app): hide accountSequence and rename phone to ID on profile page

- Remove accountSequence (ID: xxxx) display from profile page
- Rename "手机:" label to "ID:" for phone number display

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/mining-app/lib/presentation/pages/profile/profile_page.dart

@@ -175,50 +175,15 @@ class ProfilePage extends ConsumerWidget {
                   ],
                 ),
                 const SizedBox(height: 8),
-                Row(
+                // 手机号显示为ID
-                  children: [
+                if (user.phone != null)
                   Text(
-                      'ID: ${user.accountSequence ?? '--------'}',
+                    'ID: ${user.phone}',
                     style: const TextStyle(
                       fontSize: 14,
                       color: _grayText,
                     ),
                   ),
-                    const SizedBox(width: 8),
-                    GestureDetector(
-                      onTap: () {
-                        if (user.accountSequence != null) {
-                          Clipboard.setData(
-                            ClipboardData(text: user.accountSequence!),
-                          );
-                          ScaffoldMessenger.of(context).showSnackBar(
-                            const SnackBar(
-                              content: Text('ID已复制'),
-                              duration: Duration(seconds: 1),
-                            ),
-                          );
-                        }
-                      },
-                      child: const Icon(
-                        Icons.copy,
-                        size: 16,
-                        color: _grayText,
-                      ),
-                    ),
-                  ],
-                ),
-                // 手机号
-                if (user.phone != null)
-                  Padding(
-                    padding: const EdgeInsets.only(top: 4),
-                    child: Text(
-                      '手机: ${user.phone}',
-                      style: const TextStyle(
-                        fontSize: 12,
-                        color: _lightGray,
-                      ),
-                    ),
-                  ),
               ],
             ),
           ),