持久层重构为独立 MiGu.DB 工程并优化集成

- 新增 MiGu.DB 项目，迁移所有领域实体与枚举，统一模型约定
- 实现 Entity/Repository/UoW/Provider/Exception 等接口与实现
- 支持数据修补机制，完善 Sqlite 初始迁移与数据库管理
- Server 侧移除 EF Core 相关，依赖 MiGu.DB，PlatformPersistence 适配
- 业务服务注入 UoW/Repository，状态字段统一用 enum 及辅助类
- 统一异常处理，Controller 映射 HTTP 状态码
- 配置项与文档补充数据库启动、SchemaMode、迁移说明
- 新增 GlobalUsings.Db.cs、WmsStatusAliases.cs 简化类型引用
- 新增 HttpActorContextMiddleware 支持操作者上下文一致性
- 新增 MiGuDbContextModelSnapshot 追踪数据库结构
- 优化代码结构，解耦领域与持久层，提升扩展性与安全性

MiGu.Server/Controllers/WmsController.cs

@@ -1,6 +1,7 @@
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Filters;
+using MiGu.DB.Abstractions.Exceptions;
 using MiGu.Server.Wms;
 
 namespace MiGu.Server.Controllers;
@@ -276,15 +277,31 @@ public sealed class WmsExceptionFilter : IExceptionFilter
 {
     public void OnException(ExceptionContext context)
     {
-        if (context.Exception is not InvalidOperationException ex) return;
-        context.Result = new BadRequestObjectResult(new { message = ex.Message });
+        switch (context.Exception)
+        {
+            case ConcurrencyConflictException ex:
+                context.Result = new ObjectResult(new { message = ex.Message }) { StatusCode = StatusCodes.Status409Conflict };
+                break;
+            case EntityLockedException ex:
+                context.Result = new ObjectResult(new { message = ex.Message }) { StatusCode = StatusCodes.Status409Conflict };
+                break;
+            case EntityNotFoundException ex:
+                context.Result = new NotFoundObjectResult(new { message = ex.Message });
+                break;
+            case InvalidOperationException ex:
+                context.Result = new BadRequestObjectResult(new { message = ex.Message });
+                break;
+            default:
+                return;
+        }
+
         context.ExceptionHandled = true;
     }
 }
 
 public sealed class TransportRequestQuery
 {
-    public string TriggerType { get; set; } = WmsTransportTriggerTypes.MaterialCall;
+    public string TriggerType { get; set; } = nameof(WmsTransportTriggerType.MaterialCall);
     public Guid? RuleId { get; set; }
     public string? RequestSiteId { get; set; }
     public Guid? MaterialId { get; set; }