feat: configure built-in MCP access

Built-in MCP servers were always granted to supported runtimes without per-server controls. They now have persistent enablement and runtime assignments for direct models, managed OpenCode, and Continue, while DeepSeek Harness remains visibly unsupported and cannot be assigned.

MCP settings are reorganized into Built-in MCP, Direct model, Custom MCP, and Computer control tabs. Direct-model web search now uses the same accessible collapsible inventory pattern as other tool groups.

Release note: 内置 MCP 现在可分别启停并分配给直连模型、OpenCode 和 Continue；MCP 设置分类与直连模型工具列表也更清晰，DeepSeek Harness 会明确显示为暂不支持。

src/main/ipc.test.ts

@@ -118,6 +118,8 @@ describe('registerIpcHandlers computer capabilities', () => {
     }
     const capabilityService = {
       importSkill: vi.fn(async () => snapshot),
+      setBuiltinMcpServerEnabled: vi.fn(async () => snapshot),
+      setBuiltinMcpServerAssignments: vi.fn(async () => snapshot),
       setComputerCapabilityEnabled: vi.fn(async () => snapshot),
       setWebSearchEnabled: vi.fn(async () => snapshot),
       createBrowserProfile: vi.fn(async () => snapshot),
@@ -215,6 +217,31 @@ describe('registerIpcHandlers computer capabilities', () => {
     expect(capabilityService.setWebSearchEnabled).toHaveBeenCalledWith(false)
     expect(onRuntimeSettingsChanged).toHaveBeenCalledTimes(2)
 
+    await expect(
+      electronMocks.handlers.get(
+        ipcChannels.capabilitiesToggleBuiltinMcp
+      )?.(event, {
+        serverId: 'knowledge-base',
+        enabled: false
+      })
+    ).resolves.toEqual(snapshot)
+    expect(
+      capabilityService.setBuiltinMcpServerEnabled
+    ).toHaveBeenCalledWith('knowledge-base', false)
+
+    await expect(
+      electronMocks.handlers.get(
+        ipcChannels.capabilitiesAssignBuiltinMcp
+      )?.(event, {
+        serverId: 'knowledge-base',
+        assignments: ['model', 'continue']
+      })
+    ).resolves.toEqual(snapshot)
+    expect(
+      capabilityService.setBuiltinMcpServerAssignments
+    ).toHaveBeenCalledWith('knowledge-base', ['model', 'continue'])
+    expect(onRuntimeSettingsChanged).toHaveBeenCalledTimes(4)
+
     electronMocks.showOpenDialog.mockResolvedValueOnce({
       canceled: false,
       filePaths: ['C:\\meeting-helper.zip']
@@ -290,7 +317,7 @@ describe('registerIpcHandlers computer capabilities', () => {
     expect(capabilityService.createBrowserProfile).toHaveBeenCalledWith(
       '工作配置'
     )
-    expect(onRuntimeSettingsChanged).toHaveBeenCalledTimes(3)
+    expect(onRuntimeSettingsChanged).toHaveBeenCalledTimes(5)
 
     expect(() =>
       electronMocks.handlers.get(
@@ -2290,7 +2317,8 @@ describe('registerIpcHandlers agent terminal state', () => {
     knowledgeServiceOverride?: Record<string, unknown>,
     knowledgeGateway?: Record<string, unknown>,
     magicNotesEnabled = false,
-    goodbuddyConfigService?: Record<string, unknown>
+    goodbuddyConfigService?: Record<string, unknown>,
+    capabilityServiceOverride?: Record<string, unknown>
   ) {
     const assistantDatabase = {
       claimDueSchedules: vi.fn(() => []),
@@ -2394,7 +2422,7 @@ describe('registerIpcHandlers agent terminal state', () => {
         getPolicySettings,
         getResolvedSettings
       } as never,
-      {} as never,
+      (capabilityServiceOverride ?? {}) as never,
       contextManager as never,
       (knowledgeServiceOverride ?? {
         database: { listKnowledgeBases: vi.fn(() => []) }
@@ -2697,6 +2725,58 @@ describe('registerIpcHandlers agent terminal state', () => {
     await harness.dispose()
   })
 
+  it('does not grant a built-in MCP that is disabled or unassigned for the runtime', async () => {
+    const runtime = {
+      runtimeId: 'model',
+      capability: 'chat',
+      supportsToolExecution: true,
+      async *run(request: { requestId: string }) {
+        yield { requestId: request.requestId, type: 'done' }
+      }
+    }
+    const knowledgeGateway = {
+      grant: vi.fn(() => 'must-not-be-granted'),
+      getAvailableToolNames: vi.fn(() => ['note_list']),
+      drainReferences: vi.fn(() => []),
+      revoke: vi.fn()
+    }
+    const getEnabledBuiltinMcpServerIds = vi.fn(async () => [
+      'knowledge-base'
+    ])
+    const harness = createHarness(
+      runtime,
+      undefined,
+      'always',
+      undefined,
+      false,
+      undefined,
+      undefined,
+      knowledgeGateway,
+      true,
+      undefined,
+      { getEnabledBuiltinMcpServerIds }
+    )
+    const requestId = '00000000-0000-4000-8000-000000000025'
+
+    await harness.handler?.(trustedEvent(harness.webContents), {
+      requestId,
+      conversationId: 'disabled-notes',
+      prompt: '读取笔记',
+      workMode: 'ask',
+      knowledgeLibraryIds: []
+    })
+    await vi.waitFor(() =>
+      expect(harness.assistantDatabase.updateTaskStatus).toHaveBeenCalledWith(
+        requestId,
+        'completed'
+      )
+    )
+
+    expect(getEnabledBuiltinMcpServerIds).toHaveBeenCalledWith('model')
+    expect(knowledgeGateway.grant).not.toHaveBeenCalled()
+    await harness.dispose()
+  })
+
   it.each(['ask', 'execute'] as const)(
     'does not grant or advertise scoped data tools to external OpenCode in %s mode',
     async (workMode) => {