feat(client): 入库/出库搜索框支持酒名，并对搜索限流

- 搜索框 hint 改为「单号/往来单位/酒名」
- setKeyword 加去重+350ms 防抖：同词不重查、连发回车/狂点合并取最后一次，
  避免酒名模糊查询（单次约 55ms 明细扫描）被刷
- Timer 在 provider dispose 时取消

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

client/lib/providers/stock_in_provider.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../core/api/api_client.dart';
 import '../core/auth/auth_state.dart';
@@ -25,9 +27,11 @@ class StockInListNotifier extends AsyncNotifier<PageResult<StockInOrder>> {
   String? _endDate;
   String _keyword = '';
   PageResult<StockInOrder>? _cache;
+  Timer? _searchDebounce;
 
   @override
   Future<PageResult<StockInOrder>> build() async {
+    ref.onDispose(() => _searchDebounce?.cancel());
     ref.watch(authStateProvider.select((s) => s.user?.shopId));
     ref.watch(networkRecoveryCountProvider);
     try {
@@ -78,10 +82,17 @@ class StockInListNotifier extends AsyncNotifier<PageResult<StockInOrder>> {
     reload();
   }
 
+  /// 关键词搜索（含酒名模糊反查，单次约 55ms 的明细扫描）。
+  /// 去重 + 防抖限流：同词不重查；连发回车/狂点合并取最后一次，避免昂贵查询被刷。
   void setKeyword(String keyword) {
-    _keyword = keyword;
-    _page = 1;
-    reload();
+    final kw = keyword.trim();
+    if (kw == _keyword) return;
+    _searchDebounce?.cancel();
+    _searchDebounce = Timer(const Duration(milliseconds: 350), () {
+      _keyword = kw;
+      _page = 1;
+      reload();
+    });
   }
 
   void reload() {

client/lib/providers/stock_out_provider.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../core/api/api_client.dart';
 import '../core/auth/auth_state.dart';
@@ -26,9 +28,11 @@ class StockOutListNotifier extends AsyncNotifier<PageResult<StockOutOrder>> {
   String _keyword = '';
   String _productCode = '';
   PageResult<StockOutOrder>? _cache;
+  Timer? _searchDebounce;
 
   @override
   Future<PageResult<StockOutOrder>> build() async {
+    ref.onDispose(() => _searchDebounce?.cancel());
     ref.watch(authStateProvider.select((s) => s.user?.shopId));
     ref.watch(networkRecoveryCountProvider);
     try {
@@ -80,10 +84,17 @@ class StockOutListNotifier extends AsyncNotifier<PageResult<StockOutOrder>> {
     reload();
   }
 
+  /// 关键词搜索（含酒名模糊反查，单次约 55ms 的明细扫描）。
+  /// 去重 + 防抖限流：同词不重查；连发回车/狂点合并取最后一次，避免昂贵查询被刷。
   void setKeyword(String keyword) {
-    _keyword = keyword;
-    _page = 1;
-    reload();
+    final kw = keyword.trim();
+    if (kw == _keyword) return;
+    _searchDebounce?.cancel();
+    _searchDebounce = Timer(const Duration(milliseconds: 350), () {
+      _keyword = kw;
+      _page = 1;
+      reload();
+    });
   }
 
   /// 按商品编码精确反查（独立于 keyword）

client/lib/screens/stock_in/stock_in_list_screen.dart

@@ -366,7 +366,7 @@ class _StockInListScreenState extends ConsumerState<StockInListScreen> {
         final searchField = TextField(
           controller: _searchCtrl,
           decoration: InputDecoration(
-            hintText: '单号/往来单位，回车搜索',
+            hintText: '单号/往来单位/酒名，回车搜索',
             prefixIcon: const Icon(Icons.search, size: 16),
             hintStyle: const TextStyle(fontSize: 12),
             suffixIcon: IconButton(

client/lib/screens/stock_out/stock_out_list_screen.dart

@@ -378,7 +378,7 @@ class _StockOutListScreenState extends ConsumerState<StockOutListScreen> {
         final searchField = TextField(
           controller: _searchCtrl,
           decoration: InputDecoration(
-            hintText: '单号/往来单位，回车搜索',
+            hintText: '单号/往来单位/酒名，回车搜索',
             prefixIcon: const Icon(Icons.search, size: 16),
             hintStyle: const TextStyle(fontSize: 12),
             suffixIcon: IconButton(