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.DB/Kernel/Context/MiGuDbContext.Sets.cs

@@ -0,0 +1,28 @@
+using Microsoft.EntityFrameworkCore;
+using MiGu.DB.Domains.Dashboard;
+using MiGu.DB.Domains.SimpleFields;
+using MiGu.DB.Domains.Transport;
+using MiGu.DB.Domains.Wms;
+
+namespace MiGu.DB.Kernel.Context;
+
+public partial class MiGuDbContext
+{
+    public DbSet<Warehouse> Warehouses => Set<Warehouse>();
+    public DbSet<WarehouseArea> WarehouseAreas => Set<WarehouseArea>();
+    public DbSet<Storage> Storages => Set<Storage>();
+    public DbSet<Container> Containers => Set<Container>();
+    public DbSet<MaterialType> MaterialTypes => Set<MaterialType>();
+    public DbSet<Material> Materials => Set<Material>();
+    public DbSet<ContainerLocation> ContainerLocations => Set<ContainerLocation>();
+    public DbSet<ContainerMaterial> ContainerMaterials => Set<ContainerMaterial>();
+    public DbSet<StockEvent> StockEvents => Set<StockEvent>();
+    public DbSet<ContainerLocationHistory> ContainerLocationHistories => Set<ContainerLocationHistory>();
+    public DbSet<ContainerMaterialHistory> ContainerMaterialHistories => Set<ContainerMaterialHistory>();
+    public DbSet<WmsTransportRule> WmsTransportRules => Set<WmsTransportRule>();
+    public DbSet<WmsTransportTask> WmsTransportTasks => Set<WmsTransportTask>();
+    public DbSet<WmsTransportReservation> WmsTransportReservations => Set<WmsTransportReservation>();
+    public DbSet<WmsTransportTaskHistory> WmsTransportTaskHistories => Set<WmsTransportTaskHistory>();
+    public DbSet<SimpleField> SimpleFields => Set<SimpleField>();
+    public DbSet<UserDashboardShortcut> UserDashboardShortcuts => Set<UserDashboardShortcut>();
+}