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_cache_hit_rate.v

@@ -0,0 +1,81 @@
+// 测试缓存命中率
+module main
+
+import hono
+import net.http
+import time
+
+fn main() {
+	println('=== 缓存命中率测试 ===')
+	
+	mut app := hono.Hono.new()
+	
+	app.get('/users/:id', fn (mut c hono.Context) http.Response {
+		user_id := c.params['id'] or { 'unknown' }
+		return c.json('{"user_id": "${user_id}"}')
+	})
+	
+	// 获取 FastRouter 引用
+	mut router := app.fast_router
+	
+	// 预热：先匹配一次让缓存生效
+	println('\n1. 预热阶段')
+	_ := router.match_route('GET', '/users/123')
+	
+	// 获取初始统计
+	cache_size, cache_capacity := router.get_cache_stats()
+	println('   缓存大小: ${cache_size}/${cache_capacity}')
+	
+	// 测试相同路径的匹配
+	println('\n2. 测试相同路径 /users/123 匹配 1000 次')
+	sw := time.new_stopwatch()
+	
+	for _ in 0 .. 1000 {
+		_ := router.match_route('GET', '/users/123')
+	}
+	
+	elapsed := sw.elapsed()
+	println('   耗时: ${elapsed.microseconds()}μs')
+	println('   平均: ${elapsed.microseconds() / 1000}μs/次')
+	
+	// 获取缓存统计
+	cache_size2, _ := router.get_cache_stats()
+	println('   缓存大小: ${cache_size2}')
+	
+	// 测试不同路径
+	println('\n3. 测试不同路径 /users/1 到 /users/1000')
+	sw2 := time.new_stopwatch()
+	
+	for i in 1 .. 1001 {
+		_ := router.match_route('GET', '/users/${i}')
+	}
+	
+	elapsed2 := sw2.elapsed()
+	println('   耗时: ${elapsed2.microseconds()}μs')
+	println('   平均: ${elapsed2.microseconds() / 1000}μs/次')
+	
+	// 获取最终缓存统计
+	cache_size3, _ := router.get_cache_stats()
+	println('   缓存大小: ${cache_size3}')
+	
+	// 再次测试相同路径（应该命中缓存）
+	println('\n4. 再次测试 /users/500（应该命中缓存）')
+	sw3 := time.new_stopwatch()
+	
+	for _ in 0 .. 1000 {
+		_ := router.match_route('GET', '/users/500')
+	}
+	
+	elapsed3 := sw3.elapsed()
+	println('   耗时: ${elapsed3.microseconds()}μs')
+	println('   平均: ${elapsed3.microseconds() / 1000}μs/次')
+	
+	// 详细统计
+	println('\n5. 详细统计')
+	stats := router.get_detailed_stats()
+	for key, value in stats {
+		println('   ${key}: ${value}')
+	}
+	
+	println('\n=== 测试完成 ===')
+}