feat(i18n): CredFormDialog + ClusterComparePage 全量国际化 — 75 新增翻译键

- CredFormDialog.tsx: 凭据表单弹框全量迁移 (deploy.cred.form.* 37 键)
  SSH/Docker/TLS/AKSK/Database/API/Generic 7 种类型表单字段全覆盖
- ClusterComparePage.tsx: 多集群对比看板全量迁移 (k8s.compare.* 35 键)
  图表标签/表头/状态/空状态/标题全部国际化
- 新增 common.username/password/port 3 个通用键
- 翻译键总数 6182 → 6257 (zh-CN/en-US 完全对齐)
- tsc -b=0, npm build=✅ (20.76s), ESLint=0, 17/17 集成测试通过

frontend/src/locales/zh-CN.json

@@ -519,7 +519,10 @@
     "yesterday": "昨天",
     "zone": "可用区",
     "zoomIn": "放大",
-    "zoomOut": "缩小"
+    "zoomOut": "缩小",
+    "username": "用户名",
+    "password": "密码",
+    "port": "端口"
   },
   "menu": {
     "dashboard": "仪表盘",
@@ -1412,7 +1415,46 @@
       "selectDockerPwd": "选择 Docker 密码凭据",
       "selectApiCred": "选择凭据（API/密码等）",
       "selectCred": "选择凭证",
-      "linkedCred": "关联凭证"
+      "linkedCred": "关联凭证",
+      "form": {
+        "editTitle": "编辑凭据",
+        "newTitle": "新增凭据",
+        "basicInfo": "基本信息",
+        "credNamePlaceholder": "如：生产环境 SSH",
+        "varAlias": "变量别名",
+        "varAliasPlaceholder": "如：MYSQL_PROD",
+        "tagsPlaceholder": "生产环境, 阿里云",
+        "descPlaceholder": "可选备注信息",
+        "typeConfig": "配置",
+        "editHint": "（仅填写需要修改的字段）",
+        "sshUser": "SSH 用户",
+        "sshPort": "SSH 端口",
+        "sshPassword": "SSH 密码",
+        "sshPwdPlaceholder": "密码（或留空用密钥）",
+        "privateKey": "私钥内容",
+        "privateKeyPlaceholder": "粘贴 SSH 私钥...",
+        "publicKey": "公钥内容",
+        "publicKeyPlaceholder": "粘贴 SSH 公钥...",
+        "registryAddr": "Registry 地址",
+        "registryPwdPlaceholder": "Registry 密码",
+        "certPem": "证书 (PEM)",
+        "keyPem": "私钥 (PEM)",
+        "caCert": "CA 证书",
+        "caCertPlaceholder": "CA 证书内容...",
+        "dbType": "数据库类型",
+        "host": "主机",
+        "dbName": "数据库名",
+        "dbPwdPlaceholder": "数据库密码",
+        "apiEndpoint": "API 端点",
+        "apiKeyToken": "API Key / Token",
+        "secretValuePlaceholder": "密钥值",
+        "saving": "保存中...",
+        "nameRequired": "请填写凭据名称",
+        "updated": "已更新",
+        "created": "已创建",
+        "operationFailed": "操作失败",
+        "tagsLabel": "标签"
+      }
     },
     "release": {
       "title": "应用发布",
@@ -2312,6 +2354,43 @@
       "decreaseReplica": "减少副本",
       "increaseReplica": "增加副本",
       "noPod": "暂无 Pod"
+    },
+    "compare": {
+      "title": "多集群资源对比看板",
+      "subtitle": "跨集群资源用量、节点分布、健康状态对比",
+      "clusterList": "集群列表",
+      "noData": "暂无集群数据，请先添加 Kubernetes 集群并同步",
+      "goAddCluster": "去添加集群",
+      "resourceCompare": "资源数量对比",
+      "usageCompare": "CPU / 内存使用率对比",
+      "radarCompare": "资源雷达对比",
+      "nodeRoleDist": "节点角色分布",
+      "noNodeRoleData": "无节点角色数据",
+      "detailCompare": "详细对比",
+      "clickRowHint": "点击行可进入集群概览",
+      "loadFailed": "加载失败",
+      "neverSynced": "从未同步",
+      "statusHealthy": "✓ 健康",
+      "statusWarning": "⚠ 警告",
+      "statusError": "✗ 异常",
+      "chartNodes": "节点",
+      "chartPods": "Pod数",
+      "chartDeploy": "部署数",
+      "chartCpuUsage": "CPU使用",
+      "chartMemUsage": "内存使用",
+      "chartCpuCores": "CPU核数",
+      "cpuPercent": "CPU %",
+      "memPercent": "内存 %",
+      "colCluster": "集群",
+      "colNodes": "节点",
+      "colCpuCores": "CPU 核数",
+      "colMemory": "内存",
+      "colCpuUsage": "CPU 使用率",
+      "colMemUsage": "内存使用率",
+      "colRole": "角色",
+      "colSyncTime": "同步时间",
+      "statCluster": "集群",
+      "statNodes": "节点"
     }
   },
   "monitor": {