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/Wms/WmsTransportTaskService.cs

@@ -27,12 +27,13 @@ public sealed class WmsTransportTaskService
     public async Task<List<WmsTransportTask>> ListAsync(string? status = null, string? triggerType = null)
     {
         var query = _db.WmsTransportTasks.AsNoTracking().AsQueryable();
-        if (!string.IsNullOrWhiteSpace(status))
-            query = query.Where(x => x.Status == status);
+        if (!string.IsNullOrWhiteSpace(status) &&
+            Enum.TryParse<WmsTransportTaskStatus>(status.Trim(), true, out var st) &&
+            WmsTransportTaskStatuses.All.Contains(st))
+            query = query.Where(x => x.Status == st);
         if (!string.IsNullOrWhiteSpace(triggerType))
             query = query.Where(x => x.BusinessType == triggerType);
-        var rows = await query.ToListAsync();
-        return rows.OrderByDescending(x => x.CreatedAt).Take(500).ToList();
+        return await query.OrderByDescending(x => x.CreatedAt).Take(500).ToListAsync();
     }
 
     public Task<TransportCandidatePreview> PreviewCandidatesAsync(WmsTransportRequest request) =>
@@ -80,7 +81,7 @@ public sealed class WmsTransportTaskService
             if (status == WmsTransportTaskStatuses.Reserved)
                 await CreateReservationAsync(task, options, actor);
 
-            await AppendHistoryAsync(task.Id, "", task.Status, actor, request.Reason, "", task.SnapshotJson);
+            await AppendHistoryAsync(task.Id, "", task.Status.ToString(), actor, request.Reason, "", task.SnapshotJson);
             await tx.CommitAsync();
             return task;
         }
@@ -147,8 +148,8 @@ public sealed class WmsTransportTaskService
         try
         {
             await _wms.BindOrTransferLocation(new ContainerLocationRequest(
-                null, null, task.ContainerId, ContainerLocationTypes.Storage,
-                task.TargetStorageId.ToString("D"), ContainerLocationStatuses.Active,
+                null, null, task.ContainerId, ContainerLocationTypes.Storage.ToString(),
+                task.TargetStorageId.ToString("D"), ContainerLocationStatuses.Active.ToString(),
                 DateTimeOffset.UtcNow, "TransportTask", reason, false, "", "{}"), actor);
 
             await ReleaseReservationsAsync(task.Id);
@@ -245,13 +246,13 @@ public sealed class WmsTransportTaskService
         await _db.SaveChangesAsync();
     }
 
-    private async Task ChangeStatusAsync(WmsTransportTask task, string toStatus, string actor, string reason)
+    private async Task ChangeStatusAsync(WmsTransportTask task, WmsTransportTaskStatus toStatus, string actor, string reason)
     {
         var from = task.Status;
         task.Status = toStatus;
         task.UpdatedBy = actor;
         await _db.SaveChangesAsync();
-        await AppendHistoryAsync(task.Id, from, toStatus, actor, reason, task.ErrorMessage, task.SnapshotJson);
+        await AppendHistoryAsync(task.Id, from.ToString(), toStatus.ToString(), actor, reason, task.ErrorMessage, task.SnapshotJson);
     }
 
     private async Task AppendHistoryAsync(Guid taskId, string from, string to, string actor, string reason, string error, string snapshot)