feat: integration usockets backend

benchmark/README.md

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+# V-Hono Benchmark
+
+Performance benchmarks for V-Hono web framework.
+
+## Backend Comparison
+
+### uSockets vs Picoev (200 connections, 100K requests)
+
+| Backend | RPS | Avg Latency | P95 | P99 |
+|---------|-----|-------------|-----|-----|
+| uSockets | ~22,000 | 8.75ms | 16.66ms | 25.73ms |
+| picoev | ~15,000 | 13.36ms | 18.89ms | 31.66ms |
+
+**uSockets provides ~50% higher throughput under high concurrency.**
+
+### High Concurrency Test (500 connections, 100K requests)
+
+| Metric | uSockets |
+|--------|----------|
+| RPS | ~20,000 |
+| Errors | 0 |
+| Avg Latency | 25.04ms |
+| P50 | 24.32ms |
+| P95 | 32.97ms |
+| P99 | 64.59ms |
+
+## Running Benchmarks
+
+### 1. Start Test Server
+
+**uSockets backend:**
+```bash
+v -enable-globals -cc gcc -ldflags "-ldbghelp" benchmark/usockets_server.v -o server.exe
+./server.exe
+```
+
+**Picoev backend:**
+```bash
+v -enable-globals examples/picoev_example.v -o server.exe
+./server.exe
+```
+
+### 2. Run Integration Tests
+
+```bash
+go run benchmark/usockets_verify.go
+```
+
+### 3. Run Performance Tests
+
+```bash
+# 200 connections, 100K requests
+go run tests/main.go -url "http://127.0.0.1:9998" -c 200 -n 100000
+
+# 500 connections, 100K requests
+go run tests/main.go -url "http://127.0.0.1:9998" -c 500 -n 100000
+```
+
+### 4. Quick Concurrent Test (PowerShell)
+
+```powershell
+powershell -File benchmark/quick_test.ps1
+```
+
+## Test Files
+
+| File | Description |
+|------|-------------|
+| `usockets_server.v` | uSockets test server with full API |
+| `usockets_verify.go` | Go integration test (17 test cases) |
+| `quick_test.ps1` | PowerShell concurrent test script |
+| `../tests/main.go` | Go performance benchmark tool |
+
+## Test Coverage
+
+The integration test (`usockets_verify.go`) covers:
+
+- ✅ Basic GET routes (root, health, static)
+- ✅ Dynamic routes (single/multi/nested params)
+- ✅ Query parameters
+- ✅ Response formats (JSON, HTML, custom status)
+- ✅ HTTP methods (POST, PUT, DELETE)
+- ✅ Error handling (404)
+- ✅ Keep-Alive connections
+- ✅ Throughput performance