chore: 统一本地服务器与远程仓库源码

- 合并 main 与 master 历史并以服务器结构为基线
- 保留迁移、数据保留、AWS 账单与部署安全能力
- 建立 SDD 规格和 CI 验证闭环

backend/cloud/billing.go

@@ -17,7 +17,7 @@ type BillingFetcher interface {
 }
 
 // SupportedBillingProviders 已接入账单 API 的云厂商列表。 // Logan.Li
-var SupportedBillingProviders = []string{"aliyun", "tencent", "aws", "huawei", "azure"}
+var SupportedBillingProviders = []string{"aliyun", "tencent", "aws"}
 
 // NewBillingFetcher 根据云厂商创建账单拉取器
 func NewBillingFetcher(provider, accessKey, secretKey string) BillingFetcher {
@@ -28,10 +28,6 @@ func NewBillingFetcher(provider, accessKey, secretKey string) BillingFetcher {
 		return NewTencentProvider(accessKey, secretKey)
 	case "aws":
 		return NewAWSProvider(accessKey, secretKey)
-	case "huawei":
-		return NewHuaweiProvider(accessKey, secretKey)
-	case "azure":
-		return NewAzureProvider(accessKey, secretKey)
 	}
 	return nil
 }