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.DB/Domains/Migrators/DataMigrators.cs

@@ -29,35 +29,16 @@ public sealed class SimpleFieldsCarTypeBackfillMigrator : IDataMigrator
     }
 }
 
-/// <summary>
-/// 把库内旧状态字符串刷成规范枚举名（Available/Idle→Empty，Occupied→FullContainer）。
-/// 仅 Sqlite 表名/列名；绕过枚举 HasConversion（ExecuteUpdate + 字符串比较会 InvalidCast）。
-/// </summary>
-public sealed class LegacyStatusNormalizationMigrator : IDataMigrator
+/// <summary>库区 LayoutMode 空值补 Flat（raw UPDATE，避开枚举 converter）。</summary>
+public sealed class AreaLayoutModeDefaultMigrator : IDataMigrator
 {
     public int Order => 15;
-    public string Name => "Wms.LegacyStatusNormalization";
+    public string Name => "Wms.AreaLayoutModeDefault";
 
     public async Task MigrateAsync(DbContext db, CancellationToken ct = default)
     {
         if (db is not MiGuDbContext) return;
 
-        await db.Database.ExecuteSqlRawAsync(
-            """
-            UPDATE wms_storages
-            SET Status = 'Empty'
-            WHERE Status IN ('Available', 'Idle')
-            """,
-            ct);
-
-        await db.Database.ExecuteSqlRawAsync(
-            """
-            UPDATE wms_storages
-            SET Status = 'FullContainer'
-            WHERE Status = 'Occupied'
-            """,
-            ct);
-
         await db.Database.ExecuteSqlRawAsync(
             """
             UPDATE wms_areas
@@ -98,7 +79,7 @@ public static class DataMigratorRegistration
     public static IServiceCollection AddMiGuDataMigrators(this IServiceCollection services)
     {
         services.AddSingleton<IDataMigrator, SimpleFieldsCarTypeBackfillMigrator>();
-        services.AddSingleton<IDataMigrator, LegacyStatusNormalizationMigrator>();
+        services.AddSingleton<IDataMigrator, AreaLayoutModeDefaultMigrator>();
         services.AddSingleton<IDataMigrator, ContainerLocationStorageIdBackfillMigrator>();
         return services;
     }