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-TW.json

@@ -136,45 +136,6 @@
       "currentCommit": "目前提交",
       "latestCommit": "最新提交",
       "updateChannelChanged": "更新通道已切換",
-      "systemHistoryTitle": "系統歷史",
-      "historyTitleCpu": "CPU 使用率",
-      "historyTitleMem": "記憶體使用率",
-      "historyTitleNetwork": "網路頻寬",
-      "historyTitlePackets": "網路封包",
-      "historyTitleDisk": "磁碟 I/O",
-      "historyTitleOnline": "線上用戶端",
-      "historyTitleLoad": "系統平均負載（1 分鐘 / 5 分鐘 / 15 分鐘）",
-      "historyTitleConnections": "使用中的連線 (TCP / UDP)",
-      "historyTitleDiskUsage": "磁碟空間使用率",
-      "historyTabBandwidth": "頻寬",
-      "historyTabPackets": "封包",
-      "historyTabDisk": "磁碟 I/O",
-      "historyTabOnline": "線上",
-      "historyTabLoad": "負載",
-      "historyTabConnections": "連線數",
-      "historyTabDiskUsage": "磁碟使用量",
-      "xrayMetricsTitle": "Xray 指標",
-      "xrayTitleHeap": "已配置的堆積記憶體",
-      "xrayTitleSys": "向作業系統保留的記憶體",
-      "xrayTitleObjects": "存活的堆積物件",
-      "xrayTitleGcCount": "已完成的 GC 週期",
-      "xrayTitleGcPause": "GC 暫停時間",
-      "xrayTitleObservatory": "出站連線健康狀態",
-      "xrayTabHeap": "堆積",
-      "xrayTabSys": "系統",
-      "xrayTabObjects": "物件",
-      "xrayTabGcCount": "GC 次數",
-      "xrayTabGcPause": "GC 暫停",
-      "xrayTabObservatory": "觀測站",
-      "xrayMetricsDisabled": "未設定 Xray 指標端點",
-      "xrayMetricsHint": "在 xray 設定中加入頂層 metrics 區塊,tag 為 metrics_out,listen 為 127.0.0.1:11111,然後重啟 xray。",
-      "xrayObservatoryEmpty": "尚無 Observatory 資料",
-      "xrayObservatoryHint": "在 xray 設定中加入 observatory 區塊,列出要探測的出站 tag,然後重啟 xray。",
-      "xrayObservatoryTagPlaceholder": "選擇出站",
-      "xrayObservatoryAlive": "在線",
-      "xrayObservatoryDead": "離線",
-      "xrayObservatoryLastSeen": "最後在線",
-      "xrayObservatoryLastTry": "最後嘗試",
       "connectionCount": "連線數",
       "ipAddresses": "IP 地址",
       "toggleIpVisibility": "切換 IP 可見性",
@@ -191,18 +152,6 @@
       "panelUpdateUnknownTitle": "無法確認更新是否已完成",
       "panelUpdateUnknownDesc": "面板未能及時回報結果。請重新整理以檢查目前版本，或檢查伺服器日誌。",
       "dontRefresh": "安裝中，請勿重新整理此頁面",
-      "logs": "記錄",
-      "accessLogs": "存取記錄",
-      "autoUpdate": "自動更新",
-      "amneziawgLogs": "AmneziaWG 日誌",
-      "amneziawgHandshake": "最後握手",
-      "amneziawgInterface": "網路介面",
-      "amneziawgInbound": "入站",
-      "amneziawgEndpoint": "端點",
-      "amneziawgIdle": "閒置",
-      "amneziawgEvents": "事件",
-      "amneziawgNoPeers": "目前沒有活躍的 AmneziaWG 對端",
-      "amneziawgNoEvents": "尚未記錄 AmneziaWG 事件",
       "config": "配置",
       "backupTitle": "備份和恢復",
       "exportDatabase": "備份",
@@ -219,25 +168,14 @@
       "importDatabasePgDesc": "點擊選擇並上傳 PostgreSQL 備份（.dump）、SQLite 資料庫（.db）或 SQLite 遷移匯出檔以還原您的資料庫。此操作將取代所有目前的資料。",
       "migrationDownload": "下載遷移檔案",
       "migrationDownloadPgDesc": "點擊下載由 PostgreSQL 資料建立的 .db SQLite 資料庫，可用於在 SQLite 上執行本面板。",
-      "avg": "均值",
-      "peak": "峰值",
       "free": "剩餘",
       "openSockets": "開啟的通訊端",
       "throughputSub": "網路介面總計",
-      "avgWindow": "視窗均值",
       "healthWarm": "{list} — 偏高",
       "healthCritical": "{list} — 危險",
       "panel": "面板",
       "threads": "執行緒",
       "uptime": "執行時間",
-      "logLevelDebug": "Debug",
-      "logLevelInfo": "Info",
-      "logLevelNotice": "Notice",
-      "logLevelWarning": "Warning",
-      "logLevelError": "Error",
-      "accessDirect": "DIRECT",
-      "accessBlocked": "BLOCKED",
-      "accessProxy": "PROXY",
       "importKeepHostSettings": "保留本機設定",
       "importKeepHostSettingsDesc": "保留本面板的監聽位址、連接埠、基礎路徑、憑證與節點身分，而不是使用上傳檔案中的值。"
     },
@@ -970,7 +908,19 @@
       "pinnedCertPlaceholder": "base64 或 hex 的 SHA-256",
       "fetchPin": "取得",
       "pinFetched": "已取得節點目前憑證",
-      "pinFetchFailed": "無法取得憑證"
+      "pinFetchFailed": "無法取得憑證",
+      "nodeType": "Node Type",
+      "nodeTypeTraditional": "Traditional Panel Node",
+      "nodeTypeAgent": "Agent Lightweight Node",
+      "agentHint": "Agent nodes connect out to the master; no address, port or API token needed. An install command is generated on creation.",
+      "agentTokenTitle": "Agent Node Setup",
+      "agentTokenCreated": "Node {{name}} created successfully",
+      "agentTokenHint": "Copy the command below and run it on the node machine. This token is shown only once!",
+      "agentTokenInstructions": "The command downloads the installer, configures the master URL and token. The node comes online in ~30s.",
+      "agentTokenCopied": "Install command copied",
+      "agentTokenCopyFailed": "Copy failed, please copy manually",
+      "copyToken": "Copy Install Command",
+      "agentMasterUrlHint": "Master URL (used by agent to reach the master; change to public address if behind proxy):"
     },
     "settings": {
       "defaultTag": "預設",
@@ -1725,4 +1675,4 @@
     "noIpRecord": "❗ 沒有 IP 記錄！"
   },
   "email": {}
-}
+}