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/Entities/EntityBases.cs

@@ -0,0 +1,46 @@
+using MiGu.DB.Abstractions.Entities;
+
+namespace MiGu.DB.Kernel.Entities;
+
+public abstract class Entity<TKey> : IEntity<TKey>
+{
+    public TKey Id { get; set; } = default!;
+}
+
+public abstract class AuditedEntity : Entity<Guid>, IAuditable
+{
+    public DateTimeOffset CreatedAt { get; set; }
+    public DateTimeOffset UpdatedAt { get; set; }
+    public string CreatedBy { get; set; } = "";
+    public string UpdatedBy { get; set; } = "";
+}
+
+public abstract class SoftDeletableEntity : AuditedEntity, ISoftDeletable, IVersioned, ILockable
+{
+    public bool IsDeleted { get; set; }
+    public DateTimeOffset? DeletedAt { get; set; }
+    public string DeletedBy { get; set; } = "";
+    public long Version { get; set; }
+    public bool IsLock { get; set; }
+}
+
+public abstract class AggregateRoot : SoftDeletableEntity, IRemarkable, IExtendable
+{
+    public string Remark { get; set; } = "";
+    public string Extend { get; set; } = "{}";
+}
+
+public abstract class HistoryEntity : Entity<Guid>, IHistoryEntry
+{
+    public Guid? RelationId { get; set; }
+    public string EventType { get; set; } = "";
+    public string BeforeJson { get; set; } = "{}";
+    public string AfterJson { get; set; } = "{}";
+    public Guid? ContainerId { get; set; }
+    public string Operator { get; set; } = "";
+    public DateTimeOffset OperatedAt { get; set; }
+    public string Source { get; set; } = "Manual";
+    public string Reason { get; set; } = "";
+    public string Remark { get; set; } = "";
+    public string Extend { get; set; } = "{}";
+}