feat: add unlimited levels of route group and middleware

Author: onanying

docs/3.0/zh-cn/mix-vega.md

@@ -196,13 +196,11 @@ $vega->handle('/hello', function (Mix\Vega\Context $ctx) {
 
 ```php
 $vega = new Mix\Vega\Engine();
-$sub = $vega->pathPrefix('/foo');
-$sub->handle('/bar1', function (Mix\Vega\Context $ctx) {
+$foo = $vega->pathPrefix('/foo');
+$bar = $foo->pathPrefix('/bar');
+$bar->handle('/baz', function (Mix\Vega\Context $ctx) { // path=/foo/bar/baz
     $ctx->string(200, 'hello, world!');
 })->methods('GET');
-$sub->handle('/bar2', function (Mix\Vega\Context $ctx) {
-    $ctx->string(200, 'hello1, world!');
-})->methods('GET');
 ```
 
 ## 参数获取
@@ -408,7 +406,9 @@ $vega->handle('/hello', $func, function (Mix\Vega\Context $ctx) {
 })->methods('GET');
 ```
 
-配置全局中间件，即便没有匹配到路由也会执行
+配置全局中间件
+
+- 全局中间件：即便没有匹配到路由也会执行
 
 ```php
 $vega = new Mix\Vega\Engine();
@@ -417,6 +417,16 @@ $vega->use(function (Mix\Vega\Context $ctx) {
 });
 ```
 
+- 路由前缀全局中间件
+
+```php
+$vega = new Mix\Vega\Engine();
+$foo = $vega->pathPrefix('/foo');
+$foo->use(function (Mix\Vega\Context $ctx) {
+    $ctx->next();
+});
+```
+
 前置中间件
 
 ```php

src/vega/README.md

@@ -419,9 +419,9 @@ $vega->handle('/hello', $func, function (Mix\Vega\Context $ctx) {
 })->methods('GET');
 ```
 
-配置全局中间件，即便没有匹配到路由也会执行
+配置全局中间件
 
-- 全局中间件
+- 全局中间件：即便没有匹配到路由也会执行
 
 ```php
 $vega = new Mix\Vega\Engine();

src/vega/README_EN.md

@@ -410,9 +410,9 @@ $vega->handle('/hello', $func, function (Mix\Vega\Context $ctx) {
 })->methods('GET');
 ```
 
-Configure the global middleware, it will be executed even if the route is not matched
+Configure the global middleware
 
-- Global middleware
+- Global middleware: it will be executed even if the route is not matched
 
 ```php
 $vega = new Mix\Vega\Engine();