perf: use picoev as default Server for improve response concurrency

examples/server_veb.v

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+// veb 服务器示例 - 用于性能对比测试
+// veb 是 V 语言官方的新版 web 框架（替代旧的 vweb）
+// 
+// 运行: v run server_veb.v
+// 测试: curl http://127.0.0.1:8080/
+//
+// 压测命令:
+//   wrk -t4 -c100 -d10s http://127.0.0.1:8080/
+//   wrk -t4 -c100 -d10s http://127.0.0.1:8080/api/users/123
+
+module main
+
+import veb
+import time
+
+// 应用状态
+pub struct App {
+pub:
+	start_time time.Time = time.now()
+}
+
+// Context 类型
+pub struct Context {
+	veb.Context
+}
+
+fn main() {
+	println('╔═══════════════════════════════════════════════════════════════╗')
+	println('║              veb 服务器 - 性能对比测试                        ║')
+	println('╠═══════════════════════════════════════════════════════════════╣')
+	println('║ 端口: 8080                                                    ║')
+	println('║ 测试端点:                                                     ║')
+	println('║   GET  /                    - Hello World                     ║')
+	println('║   GET  /api/health          - 健康检查                        ║')
+	println('║   GET  /api/users           - 获取用户列表                    ║')
+	println('║   POST /api/users           - 创建用户                        ║')
+	println('║   GET  /api/users/:id       - 获取单个用户                    ║')
+	println('║   GET  /api/users/:id/posts - 获取用户帖子                    ║')
+	println('╚═══════════════════════════════════════════════════════════════╝')
+	println('')
+	println('启动 veb 服务器在端口 8080...')
+	
+	mut app := &App{}
+	veb.run[App, Context](mut app, 8080)
+}
+
+// ============================================
+// 静态路由
+// ============================================
+
+// 首页
+@['/']
+pub fn (app &App) index(mut ctx Context) veb.Result {
+	ctx.set_header(.connection, 'close')
+	return ctx.text('Hello World')
+}
+
+// 健康检查
+@['/api/health']
+pub fn (app &App) health(mut ctx Context) veb.Result {
+	ctx.set_header(.connection, 'close')
+	return ctx.text('OK')
+}
+
+// 获取用户列表
+@['/api/users'; get]
+pub fn (app &App) get_users(mut ctx Context) veb.Result {
+	ctx.set_header(.connection, 'close')
+	return ctx.json[[]User]([
+		User{id: '1', name: 'Alice', email: 'alice@example.com'},
+		User{id: '2', name: 'Bob', email: 'bob@example.com'},
+	])
+}
+
+// 创建用户
+@['/api/users'; post]
+pub fn (app &App) create_user(mut ctx Context) veb.Result {
+	ctx.set_header(.connection, 'close')
+	return ctx.json[CreateResponse](CreateResponse{created: true, id: '3'})
+}
+
+// ============================================
+// 动态路由
+// ============================================
+
+// 获取单个用户
+@['/api/users/:id']
+pub fn (app &App) get_user(mut ctx Context, id string) veb.Result {
+	ctx.set_header(.connection, 'close')
+	return ctx.json[User](User{id: id, name: 'User ${id}', email: 'user${id}@example.com'})
+}
+
+// 获取用户的帖子
+@['/api/users/:id/posts']
+pub fn (app &App) get_user_posts(mut ctx Context, id string) veb.Result {
+	ctx.set_header(.connection, 'close')
+	return ctx.json[PostsResponse](PostsResponse{
+		user_id: id
+		posts: [
+			Post{id: '1', title: 'First Post', content: 'Hello World'},
+			Post{id: '2', title: 'Second Post', content: 'V is awesome'},
+		]
+	})
+}
+
+// 获取特定帖子
+@['/api/users/:user_id/posts/:post_id']
+pub fn (app &App) get_user_post(mut ctx Context, user_id string, post_id string) veb.Result {
+	ctx.set_header(.connection, 'close')
+	return ctx.json[PostResponse](PostResponse{
+		user_id: user_id
+		post_id: post_id
+		post: Post{id: post_id, title: 'Post ${post_id}', content: 'Content of post ${post_id}'}
+	})
+}
+
+// 获取分类商品
+@['/api/categories/:cat/items/:item']
+pub fn (app &App) get_category_item(mut ctx Context, cat string, item string) veb.Result {
+	ctx.set_header(.connection, 'close')
+	return ctx.json[ItemResponse](ItemResponse{
+		category: cat
+		item: item
+		price: 99.99
+	})
+}
+
+// ============================================
+// 数据结构
+// ============================================
+
+struct User {
+	id    string
+	name  string
+	email string
+}
+
+struct Post {
+	id      string
+	title   string
+	content string
+}
+
+struct CreateResponse {
+	created bool
+	id      string
+}
+
+struct PostsResponse {
+	user_id string
+	posts   []Post
+}
+
+struct PostResponse {
+	user_id string
+	post_id string
+	post    Post
+}
+
+struct ItemResponse {
+	category string
+	item     string
+	price    f64
+}