feat(shop): 门店 logo 上传 + 侧边栏品牌替换

- shops 表新增 logo_url 字段，AutoMigrate 自动建列
- 后端新增 POST /api/v1/shop/logo 接口（管理员），图片裁剪为 256×256 JPEG 存储
- UpdateInfo 支持传入 logo_url
- 侧边栏「岩美」替换为门店真实名称 + 自定义 logo
- 无 logo 时显示店名首字文字头像（深蓝底白字）
- 设置页「酒行信息」展示 logo 预览，编辑弹窗新增「更换 Logo」上传按钮
- 修复库存导入计数逻辑：total/imported/updated/errors 四项分别统计
- 库存导入去重改为双路索引（编号 + 名称|系列|规格），避免 key 不一致误判新增
- settings 页导入结果统一显示「重复 X 条」，兼容 skipped 和 updated 两个字段

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/lib/screens/shell/app_shell.dart

@@ -5,8 +5,10 @@ import 'package:go_router/go_router.dart';
 import 'package:intl/intl.dart';
 import 'dart:async';
 import '../../core/auth/auth_state.dart';
+import '../../core/config/app_config.dart';
 import '../../core/theme/app_theme.dart';
 import '../../providers/connectivity_provider.dart';
+import '../../providers/shop_provider.dart';
 import '../../providers/update_provider.dart';
 
 class AppShell extends ConsumerStatefulWidget {
@@ -575,27 +577,31 @@ void _showShopPanel(BuildContext context, AuthUser u, {String version = 'v1.0.0'
     );
 }
 
-class _ShopButton extends StatelessWidget {
+class _ShopButton extends ConsumerWidget {
   final AuthUser? user;
   final String version;
   const _ShopButton({this.user, this.version = 'v1.0.0'});
 
   @override
-  Widget build(BuildContext context) {
+  Widget build(BuildContext context, WidgetRef ref) {
+    final shopAsync = ref.watch(shopInfoProvider);
+    final shopName = shopAsync.valueOrNull?.name ?? user?.shopNo ?? '';
+    final logoUrl = shopAsync.valueOrNull?.logoUrl ?? '';
+
     return MouseRegion(
       cursor: SystemMouseCursors.click,
       child: GestureDetector(
         onTap: () {
           if (user != null) _showShopPanel(context, user!, version: version);
         },
-        child: const Row(
+        child: Row(
           mainAxisSize: MainAxisSize.min,
           children: [
-            _YanmeiMark(size: 28),
-            SizedBox(width: 10),
+            _ShopLogo(logoUrl: logoUrl, shopName: shopName, size: 28),
+            const SizedBox(width: 10),
             Text(
-              '岩美',
-              style: TextStyle(
+              shopName.isEmpty ? '—' : shopName,
+              style: const TextStyle(
                   color: Colors.white,
                   fontSize: 18,
                   fontWeight: FontWeight.w600,
@@ -608,70 +614,54 @@ class _ShopButton extends StatelessWidget {
   }
 }
 
-/// Brand mark widget — approximates the 岩美 logo SVG without flutter_svg.
-/// Dark blue rounded rect, white mountain/wave strokes, bordeaux dot.
-class _YanmeiMark extends StatelessWidget {
+/// 门店 Logo：有图片显示网络图片，无图片显示店名首字文字头像。
+class _ShopLogo extends StatelessWidget {
+  final String logoUrl;
+  final String shopName;
   final double size;
-  const _YanmeiMark({this.size = 32});
+  const _ShopLogo({required this.logoUrl, required this.shopName, this.size = 32});
 
   @override
   Widget build(BuildContext context) {
+    final radius = BorderRadius.circular(size * 0.19);
+    if (logoUrl.isNotEmpty) {
+      final fullUrl = logoUrl.startsWith('http') ? logoUrl : '${AppConfig.apiBaseUrl.replaceAll('/api/v1', '')}$logoUrl';
+      return ClipRRect(
+        borderRadius: radius,
+        child: Image.network(
+          fullUrl,
+          width: size,
+          height: size,
+          fit: BoxFit.cover,
+          errorBuilder: (_, __, ___) => _initial(radius),
+        ),
+      );
+    }
+    return _initial(radius);
+  }
+
+  Widget _initial(BorderRadius radius) {
+    final initial = shopName.isNotEmpty ? shopName.characters.first : '店';
     return Container(
       width: size,
       height: size,
       decoration: BoxDecoration(
         color: const Color(0xFF0F3057),
-        borderRadius: BorderRadius.circular(size * 0.19),
+        borderRadius: radius,
       ),
-      child: CustomPaint(
-        painter: _YanmeiMarkPainter(),
+      alignment: Alignment.center,
+      child: Text(
+        initial,
+        style: TextStyle(
+          color: Colors.white,
+          fontSize: size * 0.5,
+          fontWeight: FontWeight.w600,
+        ),
       ),
     );
   }
 }
 
-class _YanmeiMarkPainter extends CustomPainter {
-  @override
-  void paint(Canvas canvas, Size size) {
-    final w = size.width;
-    final h = size.height;
-    final paint = Paint()
-      ..color = Colors.white
-      ..strokeWidth = w * 0.055
-      ..style = PaintingStyle.stroke
-      ..strokeCap = StrokeCap.round
-      ..strokeJoin = StrokeJoin.round;
-
-    // Mountain/wave path: M14 38 L22 22 L32 32 L42 22 L50 38 (on 64px grid)
-    final path = Path();
-    path.moveTo(w * 0.219, h * 0.594);
-    path.lineTo(w * 0.344, h * 0.344);
-    path.lineTo(w * 0.500, h * 0.500);
-    path.lineTo(w * 0.656, h * 0.344);
-    path.lineTo(w * 0.781, h * 0.594);
-    canvas.drawPath(path, paint);
-
-    // Horizontal baseline: M12 46 L52 46 (on 64px grid)
-    canvas.drawLine(
-      Offset(w * 0.1875, h * 0.719),
-      Offset(w * 0.8125, h * 0.719),
-      paint,
-    );
-
-    // Bordeaux dot: circle cx=32 cy=52 r=2.4 (on 64px grid)
-    canvas.drawCircle(
-      Offset(w * 0.500, h * 0.859),
-      w * 0.042,
-      Paint()
-        ..color = const Color(0xFFC97B86)
-        ..style = PaintingStyle.fill,
-    );
-  }
-
-  @override
-  bool shouldRepaint(covariant CustomPainter oldDelegate) => false;
-}
-
 class _InfoRow extends StatelessWidget {
   final IconData icon;
   final String label;