feat: 完成B端认证系统和商户管理模块测试补全

主要变更：
- 新增B端认证系统（后台+H5）：登录、登出、Token刷新、密码修改
- 完善商户管理和商户账号管理功能
- 补全单元测试（ShopService: 72.5%, ShopAccountService: 79.8%）
- 新增集成测试（商户管理+商户账号管理）
- 归档OpenSpec提案（add-shop-account-management, implement-b-end-auth-system）
- 完善文档（使用指南、API文档、认证架构说明）

测试统计：
- 13个测试套件，37个测试用例，100%通过率
- 平均覆盖率76.2%，达标

OpenSpec验证：通过（strict模式）

internal/routes/role.go

@@ -19,6 +19,7 @@ func registerRoleRoutes(api fiber.Router, h *admin.RoleHandler, doc *openapi.Gen
 		Tags:    []string{"角色"},
 		Input:   new(model.CreateRoleRequest),
 		Output:  new(model.RoleResponse),
+		Auth:    true,
 	})
 
 	Register(roles, doc, groupPath, "GET", "", h.List, RouteSpec{
@@ -26,6 +27,7 @@ func registerRoleRoutes(api fiber.Router, h *admin.RoleHandler, doc *openapi.Gen
 		Tags:    []string{"角色"},
 		Input:   new(model.RoleListRequest),
 		Output:  new(model.RolePageResult),
+		Auth:    true,
 	})
 
 	Register(roles, doc, groupPath, "GET", "/:id", h.Get, RouteSpec{
@@ -33,6 +35,7 @@ func registerRoleRoutes(api fiber.Router, h *admin.RoleHandler, doc *openapi.Gen
 		Tags:    []string{"角色"},
 		Input:   new(model.IDReq),
 		Output:  new(model.RoleResponse),
+		Auth:    true,
 	})
 
 	Register(roles, doc, groupPath, "PUT", "/:id", h.Update, RouteSpec{
@@ -40,6 +43,7 @@ func registerRoleRoutes(api fiber.Router, h *admin.RoleHandler, doc *openapi.Gen
 		Tags:    []string{"角色"},
 		Input:   new(model.UpdateRoleParams),
 		Output:  new(model.RoleResponse),
+		Auth:    true,
 	})
 
 	Register(roles, doc, groupPath, "PUT", "/:id/status", h.UpdateStatus, RouteSpec{
@@ -47,6 +51,7 @@ func registerRoleRoutes(api fiber.Router, h *admin.RoleHandler, doc *openapi.Gen
 		Tags:    []string{"角色"},
 		Input:   new(model.UpdateRoleStatusParams),
 		Output:  nil,
+		Auth:    true,
 	})
 
 	Register(roles, doc, groupPath, "DELETE", "/:id", h.Delete, RouteSpec{
@@ -54,6 +59,7 @@ func registerRoleRoutes(api fiber.Router, h *admin.RoleHandler, doc *openapi.Gen
 		Tags:    []string{"角色"},
 		Input:   new(model.IDReq),
 		Output:  nil,
+		Auth:    true,
 	})
 
 	// 角色-权限关联
@@ -62,6 +68,7 @@ func registerRoleRoutes(api fiber.Router, h *admin.RoleHandler, doc *openapi.Gen
 		Tags:    []string{"角色"},
 		Input:   new(model.AssignPermissionsParams),
 		Output:  nil,
+		Auth:    true,
 	})
 
 	Register(roles, doc, groupPath, "GET", "/:id/permissions", h.GetPermissions, RouteSpec{
@@ -69,6 +76,7 @@ func registerRoleRoutes(api fiber.Router, h *admin.RoleHandler, doc *openapi.Gen
 		Tags:    []string{"角色"},
 		Input:   new(model.IDReq),
 		Output:  new([]model.Permission),
+		Auth:    true,
 	})
 
 	Register(roles, doc, groupPath, "DELETE", "/:role_id/permissions/:perm_id", h.RemovePermission, RouteSpec{
@@ -76,5 +84,6 @@ func registerRoleRoutes(api fiber.Router, h *admin.RoleHandler, doc *openapi.Gen
 		Tags:    []string{"角色"},
 		Input:   new(model.RemovePermissionParams),
 		Output:  nil,
+		Auth:    true,
 	})
 }