feat(client): 抽屉+设置页加退出登录入口；酒行信息显示微信号

- 左侧抽屉底部、系统设置页底部各加「退出登录」按钮（窄屏顶栏菜单
  不便时也能退出；登出后路由 redirect 自动跳 /login）
- 酒行信息 tab 补显示「微信号」行（模型/编辑弹窗早已支持 wechat_id，
  仅只读展示遗漏）

121 测试通过。todo #54 #55。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/lib/screens/settings/settings_screen.dart

@@ -78,6 +78,28 @@ class _SettingsScreenState extends ConsumerState<SettingsScreen> {
               ],
             ),
           ),
+          // 退出登录（常驻底部；登出后路由 redirect 自动跳 /login）
+          const Divider(height: 1),
+          SafeArea(
+            top: false,
+            child: Padding(
+              padding: const EdgeInsets.fromLTRB(16, 8, 16, 12),
+              child: SizedBox(
+                width: double.infinity,
+                child: OutlinedButton.icon(
+                  onPressed: () =>
+                      ref.read(authStateProvider.notifier).logout(),
+                  icon: const Icon(Icons.logout, size: 18),
+                  label: const Text('退出登录'),
+                  style: OutlinedButton.styleFrom(
+                    foregroundColor: AppTheme.danger,
+                    side: const BorderSide(color: AppTheme.danger),
+                    padding: const EdgeInsets.symmetric(vertical: 12),
+                  ),
+                ),
+              ),
+            ),
+          ),
         ],
       ),
     );
@@ -154,6 +176,10 @@ class _SettingsScreenState extends ConsumerState<SettingsScreen> {
                         label: '负责人',
                         value:
                             shop.managerName.isNotEmpty ? shop.managerName : '—'),
+                    const Divider(height: 16),
+                    _ShopInfoRow(
+                        label: '微信号',
+                        value: shop.wechatId.isNotEmpty ? shop.wechatId : '—'),
                   ],
                 ),
               ),