feat(client): 实时授权状态与会话失效处理

- 心跳读取 /auth/ping 回带的授权概况，直接刷新横幅/状态栏/只读门禁，省去单独轮询 /license/info
- 账号被停用/删除（401 USER_DISABLED）即强制重新登录
- 令牌持久化经串行队列 + 会话代号守卫，杜绝续期写入与登出交叉把失效 token 写回
- 写操作门禁（write_guard）+ 授权文案（license_copy）按 grace/readonly/locked 分阶段降级

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

client/lib/screens/inventory/inventory_list_screen.dart

@@ -79,6 +79,33 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
     ref.read(inventoryListProvider.notifier).setKeyword(_searchCtrl.text.trim());
   }
 
+  /// 备注列展示：editable 时附带编辑图标（用于 WriteGuard 的可点子控件），
+  /// 否则纯文本（只读角色占位）。
+  Widget _remarkDisplay(Inventory item, {required bool editable}) {
+    return Row(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        Text(
+          item.remark.isEmpty
+              ? '—'
+              : item.remark.length > 4
+                  ? '${item.remark.substring(0, 4)}…'
+                  : item.remark,
+          style: TextStyle(
+            color: item.remark.isEmpty
+                ? AppTheme.textSecondary
+                : AppTheme.textPrimary,
+          ),
+        ),
+        if (editable) ...[
+          const SizedBox(width: 4),
+          const Icon(Icons.edit_outlined,
+              size: 12, color: AppTheme.textSecondary),
+        ],
+      ],
+    );
+  }
+
   Future<void> _editRemark(BuildContext context, Inventory item) async {
     final ctrl = TextEditingController(text: item.remark);
     final saved = await showDialog<String>(
@@ -304,28 +331,13 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
       'remark' => DataCell(Tooltip(
           message: item.remark.isEmpty ? '' : item.remark,
           waitDuration: const Duration(milliseconds: 300),
-          child: GestureDetector(
-            onTap: WriteGuard.isReadonly(ref)
-                ? null
-                : () => _editRemark(context, item),
-            child: Row(
-              mainAxisSize: MainAxisSize.min,
-              children: [
-                Text(
-                  item.remark.isEmpty
-                      ? '—'
-                      : item.remark.length > 4
-                          ? '${item.remark.substring(0, 4)}…'
-                          : item.remark,
-                  style: TextStyle(
-                    color: item.remark.isEmpty
-                        ? AppTheme.textSecondary
-                        : AppTheme.textPrimary,
-                  ),
-                ),
-                const SizedBox(width: 4),
-                const Icon(Icons.edit_outlined, size: 12, color: AppTheme.textSecondary),
-              ],
+          // 内联编辑入口统一交给 WriteGuard：只读角色显示纯文本（无编辑图标），
+          // 授权过期则由 WriteGuard 自动置灰并在点击时弹提示——不再手搓三元 + toast。
+          child: WriteGuard(
+            placeholder: _remarkDisplay(item, editable: false),
+            child: GestureDetector(
+              onTap: () => _editRemark(context, item),
+              child: _remarkDisplay(item, editable: true),
             ),
           ))),
       'status' => DataCell(_InventoryStatusBadge(item)),
@@ -374,9 +386,11 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
       ],
       actions: [
         if (!WriteGuard.isReadonly(ref))
-          TextButton(
-            onPressed: () => _editRemark(context, item),
-            child: const Text('备注', style: TextStyle(fontSize: 13)),
+          WriteGuard(
+            child: TextButton(
+              onPressed: () => _editRemark(context, item),
+              child: const Text('备注', style: TextStyle(fontSize: 13)),
+            ),
           ),
         if (item.productId != null)
           TextButton(
@@ -622,16 +636,19 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
                         Row(
                           children: [
                             if (canCheck)
-                              OutlinedButton.icon(
-                                onPressed: () => context.go('/inventory/check'),
-                                icon: const Icon(Icons.fact_check, size: 16),
-                                label: const Text('盘点'),
-                                style: OutlinedButton.styleFrom(
-                                  padding: const EdgeInsets.symmetric(
-                                      horizontal: 10, vertical: 6),
-                                  minimumSize: Size.zero,
-                                  tapTargetSize:
-                                      MaterialTapTargetSize.shrinkWrap,
+                              WriteGuard(
+                                child: OutlinedButton.icon(
+                                  onPressed: () =>
+                                      context.go('/inventory/check'),
+                                  icon: const Icon(Icons.fact_check, size: 16),
+                                  label: const Text('盘点'),
+                                  style: OutlinedButton.styleFrom(
+                                    padding: const EdgeInsets.symmetric(
+                                        horizontal: 10, vertical: 6),
+                                    minimumSize: Size.zero,
+                                    tapTargetSize:
+                                        MaterialTapTargetSize.shrinkWrap,
+                                  ),
                                 ),
                               ),
                             const Spacer(),
@@ -671,10 +688,12 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
                       SizedBox(width: 220, child: searchField),
                       const SizedBox(width: 12),
                       if (canCheck) ...[
-                        OutlinedButton.icon(
-                          onPressed: () => context.go('/inventory/check'),
-                          icon: const Icon(Icons.fact_check, size: 16),
-                          label: const Text('发起盘点'),
+                        WriteGuard(
+                          child: OutlinedButton.icon(
+                            onPressed: () => context.go('/inventory/check'),
+                            icon: const Icon(Icons.fact_check, size: 16),
+                            label: const Text('发起盘点'),
+                          ),
                         ),
                         const SizedBox(width: 8),
                       ],