feat: 增加角色/权限管理 API 与应用层命令

src/Application/TakeoutSaaS.Application/Identity/Commands/AssignUserRolesCommand.cs

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+using MediatR;
+
+namespace TakeoutSaaS.Application.Identity.Commands;
+
+/// <summary>
+/// 为用户分配角色（覆盖式）。
+/// </summary>
+public sealed record AssignUserRolesCommand : IRequest<bool>
+{
+    public long UserId { get; init; }
+    public long[] RoleIds { get; init; } = Array.Empty<long>();
+}

src/Application/TakeoutSaaS.Application/Identity/Commands/BindRolePermissionsCommand.cs

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+using MediatR;
+
+namespace TakeoutSaaS.Application.Identity.Commands;
+
+/// <summary>
+/// 绑定角色权限（覆盖式）。
+/// </summary>
+public sealed record BindRolePermissionsCommand : IRequest<bool>
+{
+    public long RoleId { get; init; }
+    public long[] PermissionIds { get; init; } = Array.Empty<long>();
+}

src/Application/TakeoutSaaS.Application/Identity/Commands/CreatePermissionCommand.cs

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+using MediatR;
+using TakeoutSaaS.Application.Identity.Contracts;
+
+namespace TakeoutSaaS.Application.Identity.Commands;
+
+/// <summary>
+/// 创建权限。
+/// </summary>
+public sealed record CreatePermissionCommand : IRequest<PermissionDto>
+{
+    public string Name { get; init; } = string.Empty;
+    public string Code { get; init; } = string.Empty;
+    public string? Description { get; init; }
+}

src/Application/TakeoutSaaS.Application/Identity/Commands/CreateRoleCommand.cs

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+using MediatR;
+using TakeoutSaaS.Application.Identity.Contracts;
+
+namespace TakeoutSaaS.Application.Identity.Commands;
+
+/// <summary>
+/// 创建角色。
+/// </summary>
+public sealed record CreateRoleCommand : IRequest<RoleDto>
+{
+    public string Name { get; init; } = string.Empty;
+    public string Code { get; init; } = string.Empty;
+    public string? Description { get; init; }
+}

src/Application/TakeoutSaaS.Application/Identity/Commands/DeletePermissionCommand.cs

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+using MediatR;
+
+namespace TakeoutSaaS.Application.Identity.Commands;
+
+/// <summary>
+/// 删除权限。
+/// </summary>
+public sealed record DeletePermissionCommand : IRequest<bool>
+{
+    public long PermissionId { get; init; }
+}

src/Application/TakeoutSaaS.Application/Identity/Commands/DeleteRoleCommand.cs

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+using MediatR;
+
+namespace TakeoutSaaS.Application.Identity.Commands;
+
+/// <summary>
+/// 删除角色。
+/// </summary>
+public sealed record DeleteRoleCommand : IRequest<bool>
+{
+    public long RoleId { get; init; }
+}

src/Application/TakeoutSaaS.Application/Identity/Commands/UpdatePermissionCommand.cs

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+using MediatR;
+using TakeoutSaaS.Application.Identity.Contracts;
+
+namespace TakeoutSaaS.Application.Identity.Commands;
+
+/// <summary>
+/// 更新权限。
+/// </summary>
+public sealed record UpdatePermissionCommand : IRequest<PermissionDto?>
+{
+    public long PermissionId { get; init; }
+    public string Name { get; init; } = string.Empty;
+    public string? Description { get; init; }
+}

src/Application/TakeoutSaaS.Application/Identity/Commands/UpdateRoleCommand.cs

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+using MediatR;
+using TakeoutSaaS.Application.Identity.Contracts;
+
+namespace TakeoutSaaS.Application.Identity.Commands;
+
+/// <summary>
+/// 更新角色。
+/// </summary>
+public sealed record UpdateRoleCommand : IRequest<RoleDto?>
+{
+    public long RoleId { get; init; }
+    public string Name { get; init; } = string.Empty;
+    public string? Description { get; init; }
+}