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/webshell.go

@@ -64,6 +64,7 @@ func (r *asciicastRecorder) writeHeader() {
 		"width":     80,
 		"height":    24,
 		"timestamp": r.startTime.Unix(),
+		"aiops_input_recorded": false,
 		"env": map[string]string{
 			"SHELL": "/bin/bash",
 			"TERM":  "xterm-256color",
@@ -396,10 +397,6 @@ func (h *WebShellHandler) Terminal(c *gin.Context) {
 			case 0:
 				if msg.Data != "" {
 					stdinPipe.Write([]byte(msg.Data))
-					// 录入用户输入，回放可见键入内容 // Logan.Li
-					if recorder.Len() < maxRecordSize {
-						recorder.WriteRow([]byte(msg.Data))
-					}
 
 					// Command extraction from stdin
 					cmdBuf.WriteString(msg.Data)
@@ -469,12 +466,13 @@ func extractCommand(input string) string {
 func recordCommand(db *gorm.DB, sessionID, serverID uint, serverName, username, command string) uint {
 	now := time.Now()
 	cmd := model.SessionCommand{
-		SessionID:  sessionID,
-		ServerID:   serverID,
-		ServerName: serverName,
-		Username:   username,
-		Command:    command,
-		Timestamp:  now,
+		SessionID:   sessionID,
+		SessionType: "terminal",
+		ServerID:    serverID,
+		ServerName:  serverName,
+		Username:    username,
+		Command:     command,
+		Timestamp:   now,
 	}
 	if err := db.Create(&cmd).Error; err != nil {
 		log.Printf("[WebShell] Command record failed: %v", err)