feat(client): 库存三态 UI——抽屉挂售 switch + 三态徽章/筛选/已售 KPI 卡

- 新组件 DsSwitch（原型 atoms .switch 对照，L1 已登记：38×22 pill，on=primary）
- 商品抽屉状态行：三态徽章后跟挂售 switch（在售⇄库存 即时生效，已售只读，
  readonly 禁用），桌面 drawer / 移动 sheet 同组件
- 列表状态列/卡片徽章三态化（在售绿/库存蓝/已售灰，icons BADGE_ICON 补两词）；
  状态筛选改「全部/在售/库存/已售」走服务端；预警缺货退出状态维度由数量染色承担
- KPI 第四卡「缺货预警」→「已售」（sold_count，点击筛选已售）
- 原型同步：atoms/index 登记 switch 与 b-库存/b-已售、inventory 两屏三态数据、
  抽屉状态行 switch；12 道 ds 闸 + L1 同源闸全过
- golden 重录 ×9（三态徽章 + 已售卡形态）

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JJ1g8XV1YhhmHRzhwWEW7o

client/lib/widgets/product_editor_drawer.dart

@@ -20,10 +20,12 @@ import '../core/theme/app_dims.g.dart';
 import '../core/theme/context_tokens.dart';
 import '../models/product.dart';
 import '../models/product_image.dart';
+import '../providers/inventory_provider.dart' show inventoryRepositoryProvider;
 import '../providers/product_option_provider.dart';
 import '../providers/product_provider.dart';
 import '../providers/shop_provider.dart' show shopInfoProvider;
 import 'ds/ds_atoms.dart';
+import 'ds/ds_switch.dart';
 import 'ds/grid_combo_cell.dart';
 import 'ds/m_sheet.dart';
 import 'searchable_option_field.dart';
@@ -41,7 +43,10 @@ Future<void> showProductEditorDrawer(
   double? qty,
   String? unit,
   double? cost,
-  String? status, // 在售 / 预警 / 缺货
+  String? status, // 在售 / 库存 / 已售（三态显示标签）
+  int? inventoryId, // 库存行 id：非空时状态行显示挂售 switch
+  String? inventoryStatus, // stock / on_sale / sold（switch 初始态）
+  VoidCallback? onStatusChanged, // switch 切换成功后回调（列表刷新）
 }) {
   // 窄屏：底部 sheet 形态（原型 m-inventory openItem 内嵌公开页编辑）
   if (context.isMobile) {
@@ -56,7 +61,10 @@ Future<void> showProductEditorDrawer(
             qty: qty,
             unit: unit,
             cost: cost,
-            status: status),
+            status: status,
+            inventoryId: inventoryId,
+            inventoryStatus: inventoryStatus,
+            onStatusChanged: onStatusChanged),
       ),
     );
   }
@@ -83,7 +91,10 @@ Future<void> showProductEditorDrawer(
                   qty: qty,
                   unit: unit,
                   cost: cost,
-                  status: status),
+                  status: status,
+                  inventoryId: inventoryId,
+                  inventoryStatus: inventoryStatus,
+                  onStatusChanged: onStatusChanged),
             ),
           ),
         ),
@@ -106,12 +117,18 @@ class _ProductEditorDrawer extends ConsumerStatefulWidget {
   final String? unit;
   final double? cost;
   final String? status;
+  final int? inventoryId;
+  final String? inventoryStatus;
+  final VoidCallback? onStatusChanged;
   const _ProductEditorDrawer({
     required this.productId,
     this.qty,
     this.unit,
     this.cost,
     this.status,
+    this.inventoryId,
+    this.inventoryStatus,
+    this.onStatusChanged,
   });
 
   @override
@@ -125,6 +142,32 @@ class _ProductEditorDrawerState extends ConsumerState<_ProductEditorDrawer> {
   bool _uploading = false;
   bool _saving = false;
 
+  // 库存三态挂售 switch（stock⇄on_sale；sold 只读无 switch）
+  late String? _invStatus = widget.inventoryStatus;
+  bool _statusSaving = false;
+
+  Future<void> _toggleOnSale(bool on) async {
+    final id = widget.inventoryId;
+    if (id == null || _statusSaving) return;
+    final next = on ? 'on_sale' : 'stock';
+    final prev = _invStatus;
+    setState(() {
+      _invStatus = next;
+      _statusSaving = true;
+    });
+    try {
+      await ref.read(inventoryRepositoryProvider).updateStatus(id, next);
+      widget.onStatusChanged?.call();
+    } catch (e) {
+      if (mounted) {
+        setState(() => _invStatus = prev);
+        showDsToast(context, '状态更新失败：$e', bg: context.tokens.danger);
+      }
+    } finally {
+      if (mounted) setState(() => _statusSaving = false);
+    }
+  }
+
   // 介绍选择态（.pe-pick / .pe-text）
   String? _introTitle; // 已选介绍库标题；null → 占位「从介绍库选择…」
   int? _introDocId;
@@ -366,15 +409,40 @@ class _ProductEditorDrawerState extends ConsumerState<_ProductEditorDrawer> {
         rows.add(('总成本价', b(_fmtMoney(widget.qty! * cost))));
       }
     }
-    if ((widget.status ?? '').isNotEmpty) {
+    // 状态行：三态徽章 + 挂售 switch（在售⇄库存 即时生效；已售只读；readonly 禁用）
+    final invStatus = _invStatus;
+    final statusLabel = switch (invStatus) {
+      'on_sale' => '在售',
+      'sold' => '已售',
+      'stock' => '库存',
+      _ => widget.status ?? '',
+    };
+    if (statusLabel.isNotEmpty) {
+      final badge = DsBadge(statusLabel,
+          tone: switch (statusLabel) {
+            '在售' => DsBadgeTone.ok,
+            '已售' => DsBadgeTone.muted,
+            '库存' => DsBadgeTone.info,
+            '缺货' => DsBadgeTone.danger,
+            '预警' => DsBadgeTone.warn,
+            _ => DsBadgeTone.ok,
+          });
+      final canToggle = widget.inventoryId != null &&
+          invStatus != null &&
+          invStatus != 'sold' &&
+          !ref.watch(isReadonlyProvider);
       rows.add((
         '状态',
-        DsBadge(widget.status!,
-            tone: switch (widget.status) {
-              '缺货' => DsBadgeTone.danger,
-              '预警' => DsBadgeTone.warn,
-              _ => DsBadgeTone.ok,
-            })
+        Row(mainAxisSize: MainAxisSize.min, children: [
+          badge,
+          if (widget.inventoryId != null && invStatus != null && invStatus != 'sold') ...[
+            const SizedBox(width: 10),
+            DsSwitch(
+              value: invStatus == 'on_sale',
+              onChanged: canToggle && !_statusSaving ? _toggleOnSale : null,
+            ),
+          ],
+        ])
       ));
     }
     return Column(