feat: RTL/i18n, AI translate+undo, no-refresh saves, settings perf

- RTL: force dir=rtl on LabelFilter, NotesViewToggle, LabelManagementDialog
- i18n: add missing keys (notifications, privacy, edit/preview, AI translate/undo)
- Settings pages: convert to Server Components (general, appearance) + loading skeleton
- AI menu: add Translate option (10 languages) + Undo AI button in toolbar
- Fix: saveInline uses REST API instead of Server Action → eliminates all implicit refreshes in list mode
- Fix: NotesTabsView notes sync effect preserves selected note on content changes
- Fix: auto-tag suggestions now filter already-assigned labels
- Fix: color change in card view uses local state (no refresh)
- Fix: nav links use <Link> for prefetching (Settings, Admin)
- Fix: suppress duplicate label suggestions already on note
- Route: add /api/ai/translate endpoint

keep-notes/locales/zh.json

@@ -997,5 +997,65 @@
     "collapse": "收起",
     "expand": "展开",
     "open": "打开"
+  },
+  "mcpSettings": {
+    "title": "MCP 设置",
+    "description": "管理 API 密钥并配置外部工具",
+    "whatIsMcp": {
+      "title": "什么是 MCP？",
+      "description": "模型上下文协议（MCP）是一个开放协议，使 AI 模型能够与外部工具和数据源安全交互。通过 MCP，您可以将 Claude Code、Cursor 或 N8N 等工具连接到您的 Keep Notes 实例，以编程方式读取、创建和整理笔记。",
+      "learnMore": "了解更多关于 MCP"
+    },
+    "serverStatus": {
+      "title": "服务器状态",
+      "running": "运行中",
+      "stopped": "已停止",
+      "mode": "模式",
+      "url": "URL"
+    },
+    "apiKeys": {
+      "title": "API 密钥",
+      "description": "API 密钥允许外部工具通过 MCP 访问您的笔记。请保管好您的密钥。",
+      "generate": "生成新密钥",
+      "empty": "暂无 API 密钥。生成一个以开始使用。",
+      "active": "有效",
+      "revoked": "已撤销",
+      "revoke": "撤销",
+      "delete": "删除",
+      "createdAt": "创建于",
+      "lastUsed": "上次使用",
+      "never": "从未使用",
+      "confirmRevoke": "确定要撤销此密钥吗？使用该密钥的工具将失去访问权限。",
+      "confirmDelete": "确定要永久删除此密钥吗？"
+    },
+    "createDialog": {
+      "title": "生成 API 密钥",
+      "description": "创建新的 API 密钥以将外部工具连接到您的笔记。",
+      "nameLabel": "密钥名称",
+      "namePlaceholder": "例如：Claude Code、Cursor、N8N",
+      "generating": "生成中...",
+      "generate": "生成",
+      "successTitle": "API 密钥已生成",
+      "successDescription": "请立即复制您的 API 密钥。之后将无法再次查看。",
+      "copy": "复制",
+      "copied": "已复制！",
+      "done": "完成"
+    },
+    "configInstructions": {
+      "title": "配置说明",
+      "description": "使用您的 API 密钥配置这些工具。",
+      "claudeCode": {
+        "title": "Claude Code",
+        "description": "将以下内容添加到您的 Claude Code MCP 配置文件中："
+      },
+      "cursor": {
+        "title": "Cursor",
+        "description": "将以下内容添加到您的 Cursor MCP 设置中："
+      },
+      "n8n": {
+        "title": "N8N",
+        "description": "在您的 N8N MCP 节点中使用以下凭据："
+      }
+    }
   }
 }