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/controllers/auth.go

@@ -1,7 +1,9 @@
 package controllers
 
 import (
+	"lokideploy/dto"
 	"lokideploy/models"
+	"lokideploy/pkg/jwt"
 	"lokideploy/services"
 	"lokideploy/utils"
 
@@ -16,38 +18,43 @@ func NewAuthController() *AuthController {
 	return &AuthController{service: services.NewAuthService()}
 }
 
-type LoginRequest struct {
-	Username string `json:"username" binding:"required"`
-	Password string `json:"password" binding:"required"`
-}
-
-type RegisterRequest struct {
-	Username string `json:"username" binding:"required"`
-	Password string `json:"password" binding:"required,min=6"`
-	Nickname string `json:"nickname"`
-	Role     string `json:"role"`
-}
-
-type ChangePasswordRequest struct {
-	OldPassword string `json:"oldPassword" binding:"required"`
-	NewPassword string `json:"newPassword" binding:"required,min=6"`
-}
-
 func (ctrl *AuthController) Login(c *gin.Context) {
-	var req LoginRequest
+	var req dto.LoginRequest
 	if !utils.BindAndValidate(c, &req) {
 		return
 	}
-	user, token, err := ctrl.service.Login(req.Username, req.Password)
+	user, tokenPair, err := ctrl.service.Login(req.Username, req.Password)
 	if err != nil {
 		utils.Unauthorized(c, "用户名或密码错误")
 		return
 	}
-	utils.Success(c, gin.H{"token": token, "user": models.SanitizedJSON(user)})
+	utils.Success(c, gin.H{
+		"accessToken":  tokenPair.AccessToken,
+		"refreshToken": tokenPair.RefreshToken,
+		"expiresAt":    tokenPair.ExpiresAt.Unix(),
+		"user":         models.SanitizedJSON(user),
+	})
+}
+
+func (ctrl *AuthController) RefreshToken(c *gin.Context) {
+	var req dto.RefreshTokenRequest
+	if !utils.BindAndValidate(c, &req) {
+		return
+	}
+	tokenPair, err := jwt.RefreshAccessToken(req.RefreshToken)
+	if err != nil {
+		utils.Unauthorized(c, "invalid or expired refresh token")
+		return
+	}
+	utils.Success(c, gin.H{
+		"accessToken":  tokenPair.AccessToken,
+		"refreshToken": tokenPair.RefreshToken,
+		"expiresAt":    tokenPair.ExpiresAt.Unix(),
+	})
 }
 
 func (ctrl *AuthController) Register(c *gin.Context) {
-	var req RegisterRequest
+	var req dto.RegisterRequest
 	if !utils.BindAndValidate(c, &req) {
 		return
 	}
@@ -63,7 +70,7 @@ func (ctrl *AuthController) Register(c *gin.Context) {
 }
 
 func (ctrl *AuthController) GetUser(c *gin.Context) {
-	claims, ok := utils.GetUserFromContext(c)
+	claims, ok := jwt.GetUserFromContext(c)
 	if !ok {
 		utils.Unauthorized(c, "")
 		return
@@ -77,11 +84,11 @@ func (ctrl *AuthController) GetUser(c *gin.Context) {
 }
 
 func (ctrl *AuthController) ChangePassword(c *gin.Context) {
-	var req ChangePasswordRequest
+	var req dto.ChangePasswordRequest
 	if !utils.BindAndValidate(c, &req) {
 		return
 	}
-	claims, ok := utils.GetUserFromContext(c)
+	claims, ok := jwt.GetUserFromContext(c)
 	if !ok {
 		utils.Unauthorized(c, "")
 		return