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_simple.v

@@ -0,0 +1,44 @@
+// uSockets 简化测试服务器 - 与外层 main.v 配置一致
+module main
+
+import hono
+import net.http
+import x.json2
+
+// JSON 响应结构体
+struct JsonResponse {
+	message string
+}
+
+struct UserResponse {
+	user_id string
+}
+
+fn main() {
+	mut app := hono.Hono.new()
+
+	// 与外层 main.v 完全一致的路由配置（无中间件）
+	app.get('/', fn (mut c hono.Context) http.Response {
+		return c.text('Hello, World!')
+	})
+
+	app.get('/json', fn (mut c hono.Context) http.Response {
+		data := JsonResponse{message: 'Hello, JSON!'}
+		json_str := json2.encode(data)
+		return c.json(json_str)
+	})
+
+	app.get('/users/:id', fn (mut c hono.Context) http.Response {
+		user_id := c.params['id'] or { 'unknown' }
+		data := UserResponse{user_id: user_id}
+		json_str := json2.encode(data)
+		return c.json(json_str)
+	})
+
+	app.get('/health', fn (mut c hono.Context) http.Response {
+		return c.text('OK')
+	})
+
+	println('[usockets-simple] Starting on port 9999 (uSockets)...')
+	app.listen_usockets(9999)
+}