feat(mcp): 用 MCP 服务替换内置 AI Agent (#319)

在现有 HTTP 服务挂载 /mcp，让外部 AI 经共享 API Key 调用原分辨率截图、批量键鼠、ATX/WOL 和虚拟介质八个工具。所有调用共用有界 FIFO 和全局限流，复用现有采集管线与硬件控制器。

移除内置模型调用、网页 Agent 面板及旧配置，设置页提供可持续查看的 Key、统一的地址/密钥复制样式。补齐 DEB 的 libudev1 运行依赖。

验证：583 项 Rust 库测试、前端生产构建、ARMv7 设备视觉操作与介质/WOL 实测，以及默认 Release 构建和 DEB 包校验通过。

Refs #319

web/src/i18n/en-US.ts

@@ -800,7 +800,6 @@ export default {
     languageDesc: 'Choose the interface display language',
     featureVisibility: 'Feature Visibility',
     featureVisibilityDesc: 'Control which feature entry points are shown on the console page',
-    computerUseAgent: 'Computer Use Agent',
     pasteText: 'Paste Text',
     videoSettings: 'Video Capture',
     videoSettingsDesc: 'Select a capture device. Source-following inputs report their active mode automatically.',
@@ -983,85 +982,26 @@ export default {
     loadDevicesFailed: 'Failed to load device list',
     updateFailed: 'Update failed',
   },
-  computerUse: {
-    title: 'Computer Use',
-    status: {
-      waitingScreenshot: 'Capturing screen',
-      thinking: 'Thinking',
-      executing: 'Executing',
-      completed: 'Completed',
-      failed: 'Failed',
-      stopped: 'Stopped',
-      idle: 'Idle',
-    },
-    connection: {
-      connected: 'Connected',
-      disconnected: 'Disconnected',
-      socketFailed: 'Computer Use WebSocket connection failed',
-      messageFailed: 'Failed to process Computer Use WebSocket message',
-    },
-    buttons: {
-      settings: 'Settings',
-      clear: 'Clear',
-      close: 'Close',
-      send: 'Send',
-      stop: 'Stop',
-      save: 'Save',
-      clearKey: 'Clear Key',
-    },
-    reasoning: {
-      failed: 'Thinking failed',
-      process: 'Reasoning',
-      thinking: 'Thinking',
-    },
-    trace: {
-      screenshot: 'Screenshot',
-      screenshotAlt: 'Computer Use screenshot',
-      executed: 'Executed',
-    },
-    input: {
-      placeholder: 'Enter a task. Press Enter for a new line; press Ctrl+Enter to send.',
-      apiKeyRequired: 'Configure an API Key first.',
-    },
-    settings: {
-      title: 'Computer Use Settings',
-      enableAi: 'Enable AI control',
-      model: 'Model',
-      apiUrl: 'API URL',
-      apiKey: 'API Key',
-      configured: 'Configured: {source}',
-      sourceEnv: 'environment variable',
-      sourceConfig: 'configuration file',
-      sourceNone: 'not configured',
-    },
-    actions: {
-      click: 'Click ({x}, {y}) {button}',
-      doubleClick: 'Double-click ({x}, {y}) {button}',
-      move: 'Move to ({x}, {y})',
-      drag: 'Drag through {count} points',
-      scroll: 'Scroll at ({x}, {y}) dx={dx} dy={dy}',
-      typeAscii: 'Type {count} ASCII characters',
-      keypress: 'Press {keys}',
-      wait: 'Wait {ms}ms',
-      screenshot: 'Request screenshot',
-    },
-    mouseButtons: {
-      left: 'left button',
-      middle: 'middle button',
-      right: 'right button',
-    },
-    errors: {
-      configLoadFailed: 'Failed to load Computer Use settings',
-      taskFailed: 'Computer Use task failed',
-      startFailed: 'Failed to start Computer Use',
-      stopFailed: 'Failed to stop Computer Use',
-      captureUnavailable: 'The current video frame is unavailable',
-      screenshotFailed: 'Screenshot capture failed',
-    },
-    success: {
-      configSaved: 'Computer Use settings saved',
-      apiKeyCleared: 'API Key cleared',
-    },
+  mcp: {
+    title: "MCP Service",
+    description: "Let external AI tools view the screen and control input, power, and virtual media.",
+    enabled: "Enable MCP",
+    rate: "Global request rate (1–100 per second)",
+    endpoint: "Service URL",
+    copyEndpoint: "Copy service URL",
+    copyKey: "Copy API key",
+    copied: "Copied",
+    copyFailed: "Copy failed. Select and copy the text manually.",
+    keyConfigured: "A key is configured. Generate a new key to view it.",
+    keyMissing: "A key is generated automatically when enabled.",
+    regenerate: "Generate new key",
+    connectHint: "Configure the service URL and Authorization: Bearer <API Key> in your AI tool.",
+    save: "Save",
+    saved: "MCP settings saved",
+    loadFailed: "Failed to load MCP settings",
+    saveFailed: "Failed to save MCP settings",
+    invalidRate: "Request rate must be an integer from 1 to 100",
+    retry: "Retry",
   },
   statusCard: {
     connectionDetails: 'Connection details',