feat(rdp): 新增 RDP 远程桌面/SMB/账单同步能力 + 清理编译产物

主要变更：
- RDP 远程桌面：新增 backend/pkg/rdp（RDP 引擎 + credssp/display/rle/trace）、
  backend/controller/rdp*（连接/凭证/文件/会话/实时）、frontend RDP 组件与 API
- Windows SMB 文件传输：backend/pkg/winsmb
- 云账单同步：backend/pkg/billingsync + billing_sync/aliyun_billing，前端账单详情
- Agent CLI Kubernetes 工具：kubernetes_action/get、pod_execute/logs
- 服务器导入助手：server_import_helpers、ImportCredentialSettings
- 国际化与组件重构（cloud/deploy/monitor/server/system 等多模块）
- 清理编译产物二进制：移除 backend/server、backend/agent/bin/aiops-agent-*
- .gitignore：新增 backend/agent/ 与 .cache/（避免 334MB go-build 缓存误入库）

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

backend/controller/session_command.go

@@ -68,8 +68,9 @@ func (h *SessionCommandHandler) ListSessionCommands(c *gin.Context) {
 	// 联表带出会话录制大小，前端可判断能否回放 // Logan.Li
 	var items []model.SessionCommandItem
 	listQuery := h.db.Table("sys_session_commands AS sc").
-		Select("sc.*, COALESCE(ts.record_size, 0) AS session_record_size").
-		Joins("LEFT JOIN sys_terminal_sessions AS ts ON ts.id = sc.session_id")
+		Select("sc.*, COALESCE(ts.record_size, rs.record_size, 0) AS session_record_size").
+		Joins("LEFT JOIN sys_terminal_sessions AS ts ON ts.id = sc.session_id AND COALESCE(sc.session_type, 'terminal') = 'terminal'").
+		Joins("LEFT JOIN sys_rdp_sessions AS rs ON rs.id = sc.session_id AND sc.session_type = 'rdp'")
 	if req.SessionID > 0 {
 		listQuery = listQuery.Where("sc.session_id = ?", req.SessionID)
 	}