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>

start-local.ps1

@@ -0,0 +1,41 @@
+# X-Agents 本地启动脚本（Go + 前端）
+# 运行方式: .\start-local.ps1
+
+$ErrorActionPreference = "Stop"
+
+Write-Host "======================================" -ForegroundColor Cyan
+Write-Host "  X-Agents 本地启动 (Go + 前端)" -ForegroundColor Cyan
+Write-Host "======================================" -ForegroundColor Cyan
+
+# 1. 启动数据库
+Write-Host "[启动] 数据库..." -ForegroundColor Green
+docker compose -f docker-compose.dev.yml up -d
+
+# 2. 启动 Go 服务
+Write-Host "[启动] Go API 服务..." -ForegroundColor Green
+Start-Process powershell -ArgumentList "-NoExit", "-Command", @"
+cd $PWD\server
+go run ./cmd/api
+"@ -WindowStyle Normal
+
+# 3. 启动前端
+Write-Host "[启动] 前端服务..." -ForegroundColor Green
+if (Test-Path "web/package.json") {
+    Start-Process powershell -ArgumentList "-NoExit", "-Command", @"
+cd $PWD\web
+npm run dev
+"@ -WindowStyle Normal
+}
+
+Write-Host ""
+Write-Host "======================================" -ForegroundColor Green
+Write-Host "  服务已启动！" -ForegroundColor Green
+Write-Host "======================================" -ForegroundColor Green
+Write-Host ""
+Write-Host "服务地址：" -ForegroundColor White
+Write-Host "  - Go API:  http://localhost:8080" -ForegroundColor Cyan
+Write-Host "  - 前端:    http://localhost:5173" -ForegroundColor Cyan
+Write-Host "  - MySQL:   localhost:6036" -ForegroundColor Cyan
+Write-Host "  - Redis:   localhost:6037" -ForegroundColor Cyan
+
+Read-Host | Out-Null