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/bootstrap/services.go

@@ -2,9 +2,12 @@ package bootstrap
 
 import (
 	accountSvc "github.com/break/junhong_cmp_fiber/internal/service/account"
+	authSvc "github.com/break/junhong_cmp_fiber/internal/service/auth"
 	permissionSvc "github.com/break/junhong_cmp_fiber/internal/service/permission"
 	personalCustomerSvc "github.com/break/junhong_cmp_fiber/internal/service/personal_customer"
 	roleSvc "github.com/break/junhong_cmp_fiber/internal/service/role"
+	shopSvc "github.com/break/junhong_cmp_fiber/internal/service/shop"
+	shopAccountSvc "github.com/break/junhong_cmp_fiber/internal/service/shop_account"
 )
 
 // services 封装所有 Service 实例
@@ -14,7 +17,9 @@ type services struct {
 	Role             *roleSvc.Service
 	Permission       *permissionSvc.Service
 	PersonalCustomer *personalCustomerSvc.Service
-	// TODO: 新增 Service 在此添加字段
+	Shop             *shopSvc.Service
+	ShopAccount      *shopAccountSvc.Service
+	Auth             *authSvc.Service
 }
 
 // initServices 初始化所有 Service 实例
@@ -24,6 +29,8 @@ func initServices(s *stores, deps *Dependencies) *services {
 		Role:             roleSvc.New(s.Role, s.Permission, s.RolePermission),
 		Permission:       permissionSvc.New(s.Permission),
 		PersonalCustomer: personalCustomerSvc.NewService(s.PersonalCustomer, s.PersonalCustomerPhone, deps.VerificationService, deps.JWTManager, deps.Logger),
-		// TODO: 新增 Service 在此初始化
+		Shop:             shopSvc.New(s.Shop, s.Account),
+		ShopAccount:      shopAccountSvc.New(s.Account, s.Shop),
+		Auth:             authSvc.New(s.Account, s.AccountRole, s.RolePermission, s.Permission, deps.TokenManager, deps.Logger),
 	}
 }