移除历史状态归一化及相关遗留逻辑

- 移除 LegacyStatusNormalizationMigrator，仅保留 AreaLayoutModeDefaultMigrator
- 删除 WmsDispatchStatus 枚举、常量和全局 using
- 统一所有 DbContext 注入为 MiGuDbContext，移除 PlatformDbContext
- 服务实体操作统一用 IEditableRepository<T>，移除本地实现
- 移除 WmsService 的 MigrateLegacyAsync 方法
- 精简接口模型，移除部分字段和请求体
- 前端保存容器时 status 字段取自已有数据，移除写死默认值
- 更新文档，去除旧说明，统一数据库初始化流程

MiGu.Server/Dashboard/DashboardShortcutService.cs

@@ -7,7 +7,7 @@ namespace MiGu.Server.Dashboard;
 
 public sealed class DashboardShortcutService
 {
-    private readonly PlatformDbContext _db;
+    private readonly MiGuDbContext _db;
     private readonly RbacStore _rbac;
 
     private static readonly JsonSerializerOptions JsonOpts = new()
@@ -15,7 +15,7 @@ public sealed class DashboardShortcutService
         PropertyNamingPolicy = JsonNamingPolicy.CamelCase
     };
 
-    public DashboardShortcutService(PlatformDbContext db, RbacStore rbac)
+    public DashboardShortcutService(MiGuDbContext db, RbacStore rbac)
     {
         _db = db;
         _rbac = rbac;