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>

frontend/src/locales/zh-CN.json

@@ -528,10 +528,8 @@
     "dashboard": "仪表盘",
     "assets": "资产管理",
     "servers": "服务器管理",
-    "cloudAccounts": "云账号管理",
+    "cloudAccounts": "多云账号",
     "domains": "域名管理",
-    "regions": "区域管理",
-    "platforms": "云平台",
     "cloudBilling": "云账单",
     "kubernetes": "Kubernetes",
     "clusterList": "集群列表",
@@ -573,7 +571,7 @@
     "aiops": "AIOps智能",
     "aiAssistant": "智能助手",
     "aiAlertAnalyzer": "告警分析",
-    "aiPredictive": "容量预测",
+    "aiPredictive": "预测分析",
     "aiAgentCli": "Agent CLI",
     "aiLlmConfig": "大模型设置",
     "approval": "资源申请",
@@ -2858,7 +2856,7 @@
     "peopleCount": "{{count}} 人",
     "dashboard": {
       "title": "监控大屏",
-      "subtitle": "Agent 主机、Zabbix、Prometheus 与自定义仪表盘",
+      "subtitle": "Agent 主机、Zabbix 与 Prometheus 统一监控",
       "tab": {
         "agent": "Agent 主机",
         "dashboard": "自定义"
@@ -5552,7 +5550,7 @@
     "stopped": "已停用",
     "error": "异常",
     "searchAccount": "搜索账号名称或AccessKey...",
-    "accountsSubtitle": "管理多云平台的访问凭证和账号信息",
+    "accountsSubtitle": "接入多云厂商 AK，同步区域、主机与账单",
     "noAccountData": "暂无云账号数据",
     "monthlyFee": "月费用",
     "serverCount": "服务器数",
@@ -5561,10 +5559,25 @@
     "saveChanges": "保存修改",
     "createAccount": "创建账号",
     "editAccountDesc": "修改账号信息和访问凭证，留空则保持原凭证不变",
-    "addAccountDesc": "录入多云平台的访问凭证，用于资源同步与成本统计",
+    "addAccountDesc": "录入云厂商访问凭证，用于资源同步与成本统计",
     "accountNamePlaceholder": "阿里云生产账号",
-    "platformLabel": "云平台",
-    "allPlatforms": "全部平台",
+    "providerLabel": "云厂商",
+    "allProviders": "全部厂商",
+    "platformLabel": "云厂商",
+    "allPlatforms": "全部厂商",
+    "tabOverview": "概览",
+    "tabRegions": "区域",
+    "tabBilling": "账单",
+    "syncRegions": "同步区域",
+    "syncBilling": "同步账单",
+    "syncRegionsSuccess": "区域同步成功",
+    "syncRegionsFailed": "区域同步失败",
+    "importHosts": "导入主机",
+    "regionCount": "区域数",
+    "noRegions": "暂无区域，请先同步",
+    "noBillingRecords": "本月暂无账单记录",
+    "regionListHint": "账号关联区域（来自云 API 同步）",
+    "billingMonthHint": "本月账单明细",
     "loadStatsFailed": "加载统计失败",
     "loadBillingFailed": "加载账单失败",
     "loadAlertRulesFailed": "加载预警规则失败",
@@ -5576,6 +5589,14 @@
     "endDate": "结束日期",
     "query": "查询",
     "billingSubtitle": "多云成本统计、记录与预警",
+    "syncYesterday": "同步昨日",
+    "syncBillingHint": "从已配置 AK 的云账号拉取昨日账单",
+    "syncBillingInfo": "点击「同步昨日」将从多云账号中的活跃账号自动拉取账单，按产品+地域写入成本记录。当前支持阿里云。",
+    "syncBillingTiming": "出账时效：阿里云日账单通常 T+1 生成（昨日账单建议今日 10:00 后同步）；预付费订单可能当日可见，后付费按小时计费产品延迟 1 天。AK 需具备 bss:DescribeBillList 权限。",
+    "syncBillingSuccess": "账单同步成功",
+    "syncBillingPartial": "部分账号同步失败",
+    "syncBillingFailed": "账单同步失败",
+    "syncBillingResult": "{{date}} 新增 {{created}} 条，更新 {{updated}} 条",
     "today": "今日",
     "thisMonth": "本月",
     "yearly": "年度",