refactor: 前后端目录结构模块化 + v2 优化移植与缺陷修复

前端:
- src/srv/api → src/api，按域分文件夹(auth/cluster/host/storage/deployment/collector)
- 新增 http.ts 引擎(http.get/post/put/delete)，域模块改用语义化调用
- index.html 增加 favicon(匹配应用 logo 的 emerald + Activity 脉冲)

后端分层增强(保留包名):
- 新增 repository/：从 models 拆出 JsonDB 持久化层(InitDB/GetDB/Shutdown/RequestSave)
- 新增 dto/：从 controllers 抽出各域请求契约(带 binding 校验)
- 新增 pkg/crypto、pkg/jwt：从 utils 拆出安全原语(外部 jwt 别名 jwtv5 避免冲突)
- models 只留领域实体 + sanitizer；utils 只留 gin/应用相关(response/errors)

v2 优化移植与缺陷修复:
- 移植密钥分离/SSH TOFU/并发写安全/Loki 生产级配置/Docker 加固
- 修复 deployment.go 并发丢更新、Helm values 重复键、EncryptField 哨兵、loki-gateway 端点等审计缺陷
- 实现真正的优雅关停(main.go http.Server + signal + repository.Shutdown)
- 修复登录契约:后端返回 accessToken，前端 auth.ts/Login.tsx 对齐
- 补 crypto/jwt/repository 单元测试(含并发写回归)

验证: go build/vet/test 全绿；npm run build 通过；登录→鉴权→优雅关停冒烟通过

Co-Authored-By: Claude <noreply@anthropic.com>

backend/services/auth.go

@@ -2,6 +2,9 @@ package services
 
 import (
 	"lokideploy/models"
+	"lokideploy/pkg/crypto"
+	"lokideploy/pkg/jwt"
+	"lokideploy/repository"
 	"lokideploy/utils"
 )
 
@@ -11,45 +14,45 @@ func NewAuthService() *AuthService {
 	return &AuthService{}
 }
 
-func (s *AuthService) Login(username, password string) (*models.User, string, error) {
-	db := models.GetDB()
+func (s *AuthService) Login(username, password string) (*models.User, *jwt.TokenPair, error) {
+	db := repository.GetDB()
 	db.RLock()
 	defer db.RUnlock()
 	for i := range db.Users {
 		if db.Users[i].Username == username {
-			if !utils.VerifyPassword(password, db.Users[i].Password) {
-				return nil, "", utils.ErrInvalidCredentials
+			if !crypto.VerifyPassword(password, db.Users[i].Password) {
+				return nil, nil, utils.ErrInvalidCredentials
 			}
-			token, err := utils.GenerateToken(db.Users[i].ID, db.Users[i].Username, db.Users[i].Role)
+			tokenPair, err := jwt.GenerateTokenPair(db.Users[i].ID, db.Users[i].Username, db.Users[i].Role)
 			if err != nil {
-				return nil, "", err
+				return nil, nil, err
 			}
-			return &db.Users[i], token, nil
+			return &db.Users[i], tokenPair, nil
 		}
 	}
-	return nil, "", utils.ErrInvalidCredentials
+	return nil, nil, utils.ErrInvalidCredentials
 }
 
 func (s *AuthService) Register(username, password, nickname, role string) (*models.User, error) {
-	hash, err := utils.HashPassword(password)
+	hash, err := crypto.HashPassword(password)
 	if err != nil {
 		return nil, err
 	}
 	user := &models.User{
-		ID:       models.GetDB().NextID("users"),
+		ID:       repository.GetDB().NextID("users"),
 		Username: username,
 		Password: hash,
 		Nickname: nickname,
 		Role:     role,
 	}
-	if err := models.GetDB().CreateUser(user); err != nil {
+	if err := repository.GetDB().CreateUser(user); err != nil {
 		return nil, err
 	}
 	return user, nil
 }
 
 func (s *AuthService) GetUserByID(id uint) (*models.User, error) {
-	db := models.GetDB()
+	db := repository.GetDB()
 	db.RLock()
 	defer db.RUnlock()
 	for i := range db.Users {
@@ -62,20 +65,20 @@ func (s *AuthService) GetUserByID(id uint) (*models.User, error) {
 }
 
 func (s *AuthService) ChangePassword(userID uint, oldPassword, newPassword string) error {
-	db := models.GetDB()
+	db := repository.GetDB()
 	db.Lock()
 	defer db.Unlock()
 	for i := range db.Users {
 		if db.Users[i].ID == userID {
-			if !utils.VerifyPassword(oldPassword, db.Users[i].Password) {
+			if !crypto.VerifyPassword(oldPassword, db.Users[i].Password) {
 				return utils.ErrInvalidCredentials
 			}
-			hash, err := utils.HashPassword(newPassword)
+			hash, err := crypto.HashPassword(newPassword)
 			if err != nil {
 				return err
 			}
 			db.Users[i].Password = hash
-			go db.Save()
+			db.RequestSave()
 			return nil
 		}
 	}