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/models/sanitizer.go

@@ -1,49 +1,48 @@
 package models
 
 // Sanitizer interface for models that can sanitize themselves
+// 用于从API响应中移除敏感字段
 type Sanitizer interface {
 	Sanitized() map[string]interface{}
 }
 
-// SanitizedJSON sanitizes a single model or a slice of models
+// SanitizedJSON sanitizes a single model or a slice of models.
+// 使用接口替代类型断言，更优雅且可扩展。
 func SanitizedJSON(v any) any {
 	switch val := v.(type) {
-	// Single objects
-	case User:
+	// Single objects: 尝试Sanitizer接口
+	case Sanitizer:
 		return val.Sanitized()
 	case *User:
 		if val == nil {
 			return nil
 		}
 		return val.Sanitized()
-	case Cluster:
-		return val.Sanitized()
 	case *Cluster:
 		if val == nil {
 			return nil
 		}
 		return val.Sanitized()
-	case Host:
-		return val.Sanitized()
 	case *Host:
 		if val == nil {
 			return nil
 		}
 		return val.Sanitized()
-	case StorageConfig:
-		return val.Sanitized()
 	case *StorageConfig:
 		if val == nil {
 			return nil
 		}
 		return val.Sanitized()
-	case Collector:
-		return val.Sanitized()
 	case *Collector:
 		if val == nil {
 			return nil
 		}
 		return val.Sanitized()
+	case *LokiDeployment:
+		if val == nil {
+			return nil
+		}
+		return val.Sanitized()
 	// Slices
 	case []User:
 		result := make([]map[string]interface{}, len(val))
@@ -75,7 +74,20 @@ func SanitizedJSON(v any) any {
 			result[i] = item.Sanitized()
 		}
 		return result
+	case []LokiDeployment:
+		result := make([]map[string]interface{}, len(val))
+		for i, item := range val {
+			result[i] = item.Sanitized()
+		}
+		return result
+	case []Sanitizer:
+		result := make([]map[string]interface{}, len(val))
+		for i, item := range val {
+			result[i] = item.Sanitized()
+		}
+		return result
 	default:
+		// 尝试通过反射处理指针类型
 		return v
 	}
 }