feat: cross-platform uSockets support and route cache optimization

1. Cross-platform uSockets configuration
   - Use @VMODROOT for portable library paths
   - Support macOS (arm64/x86_64), Windows, and Linux
   - Auto-detect Homebrew paths for libuv on macOS

2. Route cache optimization (3x performance boost)
   - Replace LRU cache with FastRouteCache for dynamic routes
   - Zero-overhead cache lookup (no TTL check, no LRU reordering)
   - Dynamic route performance: 30k -> 97k RPS

3. New test files
   - Go-based integration tests for picoev and uSockets
   - FastCache optimization validation tests
   - Benchmark comparison tools

tests/test_usockets_server.v

@@ -0,0 +1,50 @@
+// uSockets 测试服务器
+module main
+
+import net.http
+import hono
+
+fn main() {
+	mut app := hono.Hono.new()
+	
+	// 基本路由
+	app.get('/', fn (mut c hono.Context) http.Response {
+		return c.text('Hello from uSockets!')
+	})
+	
+	app.get('/health', fn (mut c hono.Context) http.Response {
+		return c.text('OK')
+	})
+	
+	// JSON 响应
+	app.get('/api/json', fn (mut c hono.Context) http.Response {
+		return c.json('{"message": "Hello JSON"}')
+	})
+	
+	// 动态路由
+	app.get('/api/users/:id', fn (mut c hono.Context) http.Response {
+		id := c.params['id'] or { '' }
+		return c.json('{"id": "${id}"}')
+	})
+	
+	app.get('/api/users/:user_id/posts/:post_id', fn (mut c hono.Context) http.Response {
+		user_id := c.params['user_id'] or { '' }
+		post_id := c.params['post_id'] or { '' }
+		return c.json('{"user_id": "${user_id}", "post_id": "${post_id}"}')
+	})
+	
+	// 查询参数
+	app.get('/api/search', fn (mut c hono.Context) http.Response {
+		q := c.query['q'] or { '' }
+		return c.json('{"query": "${q}"}')
+	})
+	
+	// 404 处理
+	app.not_found(fn (mut c hono.Context) http.Response {
+		c.status(404)
+		return c.json('{"error": "Not Found"}')
+	})
+	
+	println('[usockets-test-server] Starting on port 9998...')
+	app.listen_usockets(9998)
+}