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/Fleet/AlarmCollector.cs

@@ -76,7 +76,7 @@ public sealed class AlarmCollector
             try
             {
                 using var scope = _scopeFactory.CreateScope();
-                var db = scope.ServiceProvider.GetRequiredService<PlatformDbContext>();
+                var db = scope.ServiceProvider.GetRequiredService<MiGuDbContext>();
                 await ReconcileAsync(db, current, ct);
             }
             catch (Exception ex)
@@ -161,7 +161,7 @@ public sealed class AlarmCollector
         }
     }
 
-    private static async Task ReconcileAsync(PlatformDbContext db, Dictionary<int, CurrentAlarm> current, CancellationToken ct)
+    private static async Task ReconcileAsync(MiGuDbContext db, Dictionary<int, CurrentAlarm> current, CancellationToken ct)
     {
         var now = DateTimeOffset.UtcNow;
         var active = await db.VehicleAlarms.Where(a => a.Status == "active").ToListAsync(ct);

MiGu.Server/Fleet/CdmTaskSync.cs

@@ -80,7 +80,7 @@ public sealed class CdmTaskSyncer
             try
             {
                 using var scope = _scopeFactory.CreateScope();
-                var db = scope.ServiceProvider.GetRequiredService<PlatformDbContext>();
+                var db = scope.ServiceProvider.GetRequiredService<MiGuDbContext>();
                 await UpsertAsync(db, dtos, ct);
             }
             catch (Exception ex)
@@ -126,7 +126,7 @@ public sealed class CdmTaskSyncer
         }
     }
 
-    private static async Task UpsertAsync(PlatformDbContext db, IReadOnlyList<CdmTaskDto> dtos, CancellationToken ct)
+    private static async Task UpsertAsync(MiGuDbContext db, IReadOnlyList<CdmTaskDto> dtos, CancellationToken ct)
     {
         var valid = dtos.Where(d => !string.IsNullOrWhiteSpace(d.id)).ToList();
         if (valid.Count == 0) return;