feat: 新增批量移除角色权限接口

- 新增 DELETE /api/admin/roles/:role_id/permissions 接口
- Store 层新增 BatchDelete 方法，单次 SQL 批量软删除
- Service 层新增 BatchRemovePermissions 方法
- Handler 层新增 BatchRemovePermissions 处理函数
- DTO 新增 BatchRemovePermissionsRequest/Params
- 修复 openapi generator 对 DELETE 方法 requestBody 不生成的问题
- RouteSpec 新增 Body 字段，支持显式指定 JSON 请求体

💘 Generated with Crush

Assisted-by: Claude Sonnet 4.6 via Crush <crush@charm.land>

internal/routes/role.go

@@ -87,4 +87,13 @@ func registerRoleRoutes(api fiber.Router, h *admin.RoleHandler, doc *openapi.Gen
 		Output:  nil,
 		Auth:    true,
 	})
+
+	Register(roles, doc, groupPath, "DELETE", "/:role_id/permissions", h.BatchRemovePermissions, RouteSpec{
+		Summary: "批量移除权限",
+		Tags:    []string{"角色"},
+		Input:   new(dto.BatchRemovePermissionsParams),
+		Body:    new(dto.BatchRemovePermissionsRequest),
+		Output:  nil,
+		Auth:    true,
+	})
 }