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/deployment.go

@@ -41,3 +41,44 @@ func (d *LokiDeployment) BeforeCreate() {
 		d.UUID = uuid.New().String()
 	}
 }
+
+// Sanitized 返回去除敏感字段（AdminPassword）的部署视图，并对嵌套的
+// Cluster/Host/StorageConfig 一并做脱敏，避免经部署接口泄漏各自凭证。
+func (d *LokiDeployment) Sanitized() map[string]interface{} {
+	out := map[string]interface{}{
+		"id":              d.ID,
+		"uuid":            d.UUID,
+		"name":            d.Name,
+		"description":     d.Description,
+		"version":         d.Version,
+		"mode":            d.Mode,
+		"clusterID":       d.ClusterID,
+		"hostID":          d.HostID,
+		"namespace":       d.Namespace,
+		"storageConfigID": d.StorageConfigID,
+		"authEnabled":     d.AuthEnabled,
+		"retentionDays":   d.RetentionDays,
+		"replicas":        d.Replicas,
+		"resourcesCPU":    d.ResourcesCPU,
+		"resourcesMem":    d.ResourcesMem,
+		"storageSize":     d.StorageSize,
+		"status":          d.Status,
+		"statusMessage":   d.StatusMessage,
+		"helmValues":      d.HelmValues,
+		"endpoint":        d.Endpoint,
+		"adminUser":       d.AdminUser,
+		// AdminPassword 故意省略
+		"createdAt": d.CreatedAt,
+		"updatedAt": d.UpdatedAt,
+	}
+	if d.Cluster != nil {
+		out["cluster"] = d.Cluster.Sanitized()
+	}
+	if d.Host != nil {
+		out["host"] = d.Host.Sanitized()
+	}
+	if d.StorageConfig != nil {
+		out["storageConfig"] = d.StorageConfig.Sanitized()
+	}
+	return out
+}