feat: 重构前后端架构，添加Go后端和Python Agent服务

- 新增 Go 语言后端服务(server/)，包含用户认证、Agent管理、数据库连接等API
- 新增 Python Agent 服务(agent/)，实现Agent核心逻辑和工具集
- 前端从原生HTML迁移到Vue.js框架(web/src/)
- 添加 Docker Compose 支持(docker-compose.yml)
- 添加项目架构文档(docs/ARCHITECTURE.md)
- 添加环境变量示例(.env.example)和本地启动脚本(start-local.ps1)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/internal/handler/system_handler.go

@@ -0,0 +1,62 @@
+package handler
+
+import (
+	"net/http"
+
+	"x-agents/server/internal/model"
+
+	"github.com/gin-gonic/gin"
+)
+
+type SystemHandler struct{}
+
+func NewSystemHandler() *SystemHandler {
+	return &SystemHandler{}
+}
+
+// GetSystemInfo 获取系统信息
+func (h *SystemHandler) GetSystemInfo(c *gin.Context) {
+	info, err := getSystemInfo()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, info)
+}
+
+// getSystemInfo 获取系统信息
+func getSystemInfo() (*model.SystemInfo, error) {
+	// 获取CPU使用率
+	cpuPercent, err := getCPUPercent()
+	if err != nil {
+		return nil, err
+	}
+
+	// 获取CPU核心数
+	coreCount, err := getCPUCoreCount()
+	if err != nil {
+		coreCount = 0
+	}
+
+	// 获取CPU型号
+	modelName, err := getCPUModelName()
+	if err != nil {
+		modelName = "Unknown"
+	}
+
+	// 获取内存信息
+	memoryInfo, err := getMemoryInfo()
+	if err != nil {
+		return nil, err
+	}
+
+	return &model.SystemInfo{
+		CPU: model.CPUInfo{
+			Percent:   cpuPercent,
+			CoreCount: coreCount,
+			ModelName: modelName,
+		},
+		Memory: *memoryInfo,
+	}, nil
+}