P7: restore agent node type, agent heartbeat expiry, build-version injection, remove log/history/xray-metrics modules, optional sub port

- nodes: port node-type (traditional/agent) picker back from web-src into
  the embedded frontend; backend annotates NodeView.nodeType from
  agent_nodes bindings; fix agent-node update path (skip reachability
  probe and apiToken requirement for agent-managed nodes); restore i18n
  keys in all 13 locales; install command now uses the Gitea mirror
- jobs: expire agent-bound nodes whose agent_nodes.last_seen is older
  than max(3x heartbeat interval, 120s) = 180s; last_seen=0 (never
  registered) is left untouched; transitions reuse UpdateHeartbeat +
  node event broadcast
- config: GetBaseVersion honors ldflags-injected buildVersion; release
  builds inject 3.7.0-agent.1 so the panel no longer reports a phantom
  update against the Gitea release tag
- logger/server: remove the three log viewers (panel/xray/amneziawg),
  their API endpoints and the 10240-entry in-memory log buffer; file
  logging via lumberjack unchanged; tests assert via a new optional
  logger hook instead of the removed buffer
- server: remove system history and xray metrics modules end to end
  (endpoints, sampling appends in RefreshStatus, per-minute persist
  cron, gob snapshot/restore, XrayMetricsService); realtime status and
  per-node history are untouched
- settings: subPort may be 0/unset - subscription links are generated
  without a port while the subscription service keeps binding the
  default 2096; the settings form declares the cleared state via
  onNumber's new onClear option instead of snapping back to 1

internal/web/translation/zh-CN.json

@@ -136,45 +136,6 @@
       "currentCommit": "当前提交",
       "latestCommit": "最新提交",
       "updateChannelChanged": "更新通道已切换",
-      "systemHistoryTitle": "系统历史",
-      "historyTitleCpu": "CPU 使用率",
-      "historyTitleMem": "内存使用率",
-      "historyTitleNetwork": "网络带宽",
-      "historyTitlePackets": "网络数据包",
-      "historyTitleDisk": "磁盘 I/O",
-      "historyTitleOnline": "在线客户端",
-      "historyTitleLoad": "系统平均负载（1 分钟 / 5 分钟 / 15 分钟）",
-      "historyTitleConnections": "活动连接 (TCP / UDP)",
-      "historyTitleDiskUsage": "磁盘空间使用率",
-      "historyTabBandwidth": "带宽",
-      "historyTabPackets": "数据包",
-      "historyTabDisk": "磁盘 I/O",
-      "historyTabOnline": "在线",
-      "historyTabLoad": "负载",
-      "historyTabConnections": "连接数",
-      "historyTabDiskUsage": "磁盘使用量",
-      "xrayMetricsTitle": "Xray 指标",
-      "xrayTitleHeap": "已分配的堆内存",
-      "xrayTitleSys": "向操作系统保留的内存",
-      "xrayTitleObjects": "存活的堆对象",
-      "xrayTitleGcCount": "已完成的 GC 周期",
-      "xrayTitleGcPause": "GC 暂停时间",
-      "xrayTitleObservatory": "出站连接健康状态",
-      "xrayTabHeap": "堆",
-      "xrayTabSys": "系统",
-      "xrayTabObjects": "对象",
-      "xrayTabGcCount": "GC 次数",
-      "xrayTabGcPause": "GC 暂停",
-      "xrayTabObservatory": "观测站",
-      "xrayMetricsDisabled": "未配置 Xray 指标端点",
-      "xrayMetricsHint": "在 xray 配置中添加顶级 metrics 块,tag 为 metrics_out,listen 为 127.0.0.1:11111,然后重启 xray。",
-      "xrayObservatoryEmpty": "暂无 Observatory 数据",
-      "xrayObservatoryHint": "在 xray 配置中添加 observatory 块,列出要探测的出站 tag,然后重启 xray。",
-      "xrayObservatoryTagPlaceholder": "选择出站",
-      "xrayObservatoryAlive": "在线",
-      "xrayObservatoryDead": "离线",
-      "xrayObservatoryLastSeen": "最后在线",
-      "xrayObservatoryLastTry": "最后尝试",
       "connectionCount": "连接数",
       "ipAddresses": "IP 地址",
       "toggleIpVisibility": "切换 IP 可见性",
@@ -191,18 +152,6 @@
       "panelUpdateUnknownTitle": "无法确认更新是否已完成",
       "panelUpdateUnknownDesc": "面板未能及时返回结果。请刷新页面查看当前版本，或检查服务器日志。",
       "dontRefresh": "安装中，请勿刷新此页面",
-      "logs": "日志",
-      "accessLogs": "访问日志",
-      "autoUpdate": "自动更新",
-      "amneziawgLogs": "AmneziaWG 日志",
-      "amneziawgHandshake": "最后握手",
-      "amneziawgInterface": "网络接口",
-      "amneziawgInbound": "入站",
-      "amneziawgEndpoint": "端点",
-      "amneziawgIdle": "空闲",
-      "amneziawgEvents": "事件",
-      "amneziawgNoPeers": "当前没有活动的 AmneziaWG 对端",
-      "amneziawgNoEvents": "尚未记录 AmneziaWG 事件",
       "config": "配置",
       "backupTitle": "备份和恢复",
       "exportDatabase": "备份",
@@ -219,25 +168,14 @@
       "importDatabasePgDesc": "点击选择并上传 PostgreSQL 备份（.dump）、SQLite 数据库（.db）或 SQLite 迁移导出文件以恢复您的数据库。此操作将替换所有当前数据。",
       "migrationDownload": "下载迁移文件",
       "migrationDownloadPgDesc": "点击下载由 PostgreSQL 数据构建的 .db SQLite 数据库，可用于在 SQLite 上运行本面板。",
-      "avg": "均值",
-      "peak": "峰值",
       "free": "剩余",
       "openSockets": "打开的套接字",
       "throughputSub": "网卡总计",
-      "avgWindow": "窗口均值",
       "healthWarm": "{list} — 偏高",
       "healthCritical": "{list} — 危险",
       "panel": "面板",
       "threads": "线程",
       "uptime": "运行时间",
-      "logLevelDebug": "Debug",
-      "logLevelInfo": "Info",
-      "logLevelNotice": "Notice",
-      "logLevelWarning": "Warning",
-      "logLevelError": "Error",
-      "accessDirect": "DIRECT",
-      "accessBlocked": "BLOCKED",
-      "accessProxy": "PROXY",
       "importKeepHostSettings": "保留本机设置",
       "importKeepHostSettingsDesc": "保留本面板的监听地址、端口、基础路径、证书和节点身份，而不是使用上传文件中的值。"
     },
@@ -970,7 +908,19 @@
       "pinnedCertPlaceholder": "base64 或 hex 的 SHA-256",
       "fetchPin": "获取",
       "pinFetched": "已获取节点当前证书",
-      "pinFetchFailed": "无法获取证书"
+      "pinFetchFailed": "无法获取证书",
+      "nodeType": "节点类型",
+      "nodeTypeTraditional": "传统面板节点",
+      "nodeTypeAgent": "Agent 轻量节点",
+      "agentHint": "Agent 节点由节点机主动连接主控，无需填写地址、端口和 API 令牌。创建后会生成安装命令。",
+      "agentTokenTitle": "Agent 节点安装",
+      "agentTokenCreated": "节点 {{name}} 创建成功",
+      "agentTokenHint": "复制下面的命令，在节点机上运行即可完成安装。此 token 只显示一次！",
+      "agentTokenInstructions": "命令会自动下载安装脚本、配置主控地址和 token，约 30 秒后节点上线。",
+      "agentTokenCopied": "安装命令已复制",
+      "agentTokenCopyFailed": "复制失败，请手动复制",
+      "copyToken": "复制安装命令",
+      "agentMasterUrlHint": "主控地址（agent 用来连接主控，如有域名或反代请改成对外地址）："
     },
     "settings": {
       "defaultTag": "默认",
@@ -1070,7 +1020,7 @@
       "subListen": "监听 IP",
       "subListenDesc": "订阅服务监听的 IP 地址（留空表示监听所有 IP）",
       "subPort": "监听端口",
-      "subPortDesc": "订阅服务监听的端口号（必须是未使用的端口）。当下方「反向代理 URI」为空时，也会用来生成面板中显示的订阅链接/二维码——如果订阅是通过反向代理的其他端口访问的，请改为设置「反向代理 URI」。",
+      "subPortDesc": "订阅服务监听的端口号（必须是未使用的端口）。当下方「反向代理 URI」为空时，也会用来生成面板中显示的订阅链接/二维码——如果订阅是通过反向代理的其他端口访问的，请改为设置「反向代理 URI」。留空表示订阅链接不带端口（服务仍监听默认端口 2096）。",
       "subCertPath": "公钥路径",
       "subCertPathDesc": "订阅服务使用的公钥文件路径（以 '/' 开头）",
       "subKeyPath": "私钥路径",
@@ -1725,4 +1675,4 @@
     "noIpRecord": "❗ 没有 IP 记录！"
   },
   "email": {}
-}
+}