feat(sync): full code sync from release

backend/internal/handler/sora_gateway_handler.go

@@ -7,7 +7,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io"
 	"net/http"
 	"os"
 	"path"
@@ -17,6 +16,7 @@ import (
 	"time"
 
 	"github.com/Wei-Shaw/sub2api/internal/config"
+	pkghttputil "github.com/Wei-Shaw/sub2api/internal/pkg/httputil"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/ip"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/logger"
 	middleware2 "github.com/Wei-Shaw/sub2api/internal/server/middleware"
@@ -107,7 +107,7 @@ func (h *SoraGatewayHandler) ChatCompletions(c *gin.Context) {
 		zap.Any("group_id", apiKey.GroupID),
 	)
 
-	body, err := io.ReadAll(c.Request.Body)
+	body, err := pkghttputil.ReadRequestBodyWithPrealloc(c.Request)
 	if err != nil {
 		if maxErr, ok := extractMaxBytesError(err); ok {
 			h.errorResponse(c, http.StatusRequestEntityTooLarge, "invalid_request_error", buildBodyTooLargeMessage(maxErr.Limit))
@@ -461,6 +461,14 @@ func (h *SoraGatewayHandler) submitUsageRecordTask(task service.UsageRecordTask)
 	// 回退路径：worker 池未注入时同步执行，避免退回到无界 goroutine 模式。
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()
+	defer func() {
+		if recovered := recover(); recovered != nil {
+			logger.L().With(
+				zap.String("component", "handler.sora_gateway.chat_completions"),
+				zap.Any("panic", recovered),
+			).Error("sora.usage_record_task_panic_recovered")
+		}
+	}()
 	task(ctx)
 }