fix: 补充执行日志 + 清理死代码

日志补充:
- browser.ts: 全部 8 个函数新增 sendLog (打开/截图/JS/提取/点击/输入/滚动/关闭)
- mcp-manager.ts: callTool 新增工具调用日志

死代码清理:
- skill-manager.ts: 删除 getAllSkillsForUI, deleteSkillById, clearAllSkills (39 行)
- memory-manager.ts: 删除 getVectorSearchResults (4 行)
- mcp-manager.ts: 删除 isServerRunning

src/main/mcp-manager.ts

@@ -240,10 +240,14 @@ export async function callTool(serverName: string, toolName: string, args: Recor
     return { success: false, error: `MCP 服务器 ${serverName} 未运行` };
   }
 
+  sendLog('info', `🔌 MCP 调用工具`, `${serverName}/${toolName} ${JSON.stringify(args || {}).slice(0, 100)}`);
+
   try {
     const result = await sendRequest(server, 'tools/call', { name: toolName, arguments: args });
+    sendLog('success', `🔌 MCP 工具完成`, `${serverName}/${toolName}`);
     return { success: true, result };
   } catch (err) {
+    sendLog('error', `🔌 MCP 工具失败`, `${serverName}/${toolName}: ${(err as Error).message}`);
     return { success: false, error: (err as Error).message };
   }
 }
@@ -289,8 +293,3 @@ export function getServerStatuses(): Array<{ name: string; running: boolean; too
   return statuses;
 }
 
-/** 检查服务器是否在运行 */
-export function isServerRunning(name: string): boolean {
-  const server = servers.get(name);
-  return !!server && server.initialized;
-}