feat: 算力引擎 Go 后端核心（new-api）

- 统一 OpenAI 兼容 /v1 中继 + 渠道/额度/令牌/流水
- 各领域包：relay 模型网关、model 数据层、controller 管理 API

common/gopool.go

@@ -0,0 +1,25 @@
+package common
+
+import (
+	"context"
+	"fmt"
+	"math"
+
+	"github.com/bytedance/gopkg/util/gopool"
+)
+
+var relayGoPool gopool.Pool
+
+func init() {
+	relayGoPool = gopool.NewPool("gopool.RelayPool", math.MaxInt32, gopool.NewConfig())
+	relayGoPool.SetPanicHandler(func(ctx context.Context, i interface{}) {
+		if stopChan, ok := ctx.Value("stop_chan").(chan bool); ok {
+			SafeSendBool(stopChan, true)
+		}
+		SysError(fmt.Sprintf("panic in gopool.RelayPool: %v", i))
+	})
+}
+
+func RelayCtxGo(ctx context.Context, f func()) {
+	relayGoPool.CtxGo(ctx, f)
+}