feat(trade): 添加交易确认文档查询功能

- 新增 TradeConfirmationDocumentQueryItem 查询项类
- 实现 TradeConfirmationDocumentQuery.Create 查询方法
- 添加按交易日期范围过滤功能
- 重构 tradeController 中的文档查询逻辑
- 集成文档、合同关系和交易数据的联合查询
- 优化查询性能通过预过滤有效合同关系

YLErpDAL/Modules/TradeModule/QueryModule/TradeConfirmationDocumentQuery.cs

@@ -0,0 +1,42 @@
+namespace YLErp.Modules.TradeModule.QueryModule
+{
+    public sealed class TradeConfirmationDocumentQueryItem
+    {
+        public trade_contract_document Document { get; set; }
+
+        public trade_contract_r Relation { get; set; }
+    }
+
+    public static class TradeConfirmationDocumentQuery
+    {
+        public static IQueryable<TradeConfirmationDocumentQueryItem> Create(
+            IQueryable<trade_contract_document> documents,
+            IQueryable<trade_contract_r> relations,
+            IQueryable<trade> trades,
+            DateTime? tradeDateStart,
+            DateTime? tradeDateEnd)
+        {
+            if (tradeDateStart.HasValue)
+            {
+                trades = trades.Where(t => t.TradeDate >= tradeDateStart.Value);
+            }
+
+            if (tradeDateEnd.HasValue)
+            {
+                var tradeDateEndExclusive = tradeDateEnd.Value.Date.AddDays(1);
+                trades = trades.Where(t => t.TradeDate < tradeDateEndExclusive);
+            }
+
+            return from document in documents
+                   join relation in relations.Where(r => r.IsValid)
+                       on document.Code equals relation.ContractCode
+                   join trade in trades
+                       on relation.TradeId equals trade.id
+                   select new TradeConfirmationDocumentQueryItem
+                   {
+                       Document = document,
+                       Relation = relation
+                   };
+        }
+    }
+}

YLErpWeb/Controllers/tradeController.cs

@@ -6299,14 +6299,17 @@ namespace YLErp.Web.Controllers
                 return ShowError("请选择文档类型!");
             }
 
-            if (req.TradeDateStart == null) { req.TradeDateStart = DateTime.MinValue; }
-            if (req.TradeDateEnd == null) { req.TradeDateEnd = DateTime.MaxValue; }
-            var db_trade_contract_r = yldb.trade_contract_r.AsQueryable();
+            var documentQuery = TradeConfirmationDocumentQuery.Create(
+                yldb.trade_contract_document,
+                yldb.trade_contract_r,
+                yldb.trade,
+                req.TradeDateStart,
+                req.TradeDateEnd);
 
-            var query = from doc in yldb.trade_contract_document
-                        join r in db_trade_contract_r
-                        on doc.Code equals r.ContractCode
-                        where doc.Type == ContractTypeEnum.Trade && doc.ValueDate >= req.TradeDateStart && doc.ValueDate <= req.TradeDateEnd && r.IsValid
+            var query = from item in documentQuery
+                        let doc = item.Document
+                        let r = item.Relation
+                        where doc.Type == ContractTypeEnum.Trade
                         select new
                         {
                             doc.ClientId,