refactor: Introduce pre-consume quota and unify relay handlers

This commit introduces a major architectural refactoring to improve quota management, centralize logging, and streamline the relay handling logic.

Key changes:
- **Pre-consume Quota:** Implements a new mechanism to check and reserve user quota *before* making the request to the upstream provider. This ensures more accurate quota deduction and prevents users from exceeding their limits due to concurrent requests.

- **Unified Relay Handlers:** Refactors the relay logic to use generic handlers (e.g., `ChatHandler`, `ImageHandler`) instead of provider-specific implementations. This significantly reduces code duplication and simplifies adding new channels.

- **Centralized Logger:** A new dedicated `logger` package is introduced, and all system logging calls are migrated to use it, moving this responsibility out of the `common` package.

- **Code Reorganization:** DTOs are generalized (e.g., `dalle.go` -> `openai_image.go`) and utility code is moved to more appropriate packages (e.g., `common/http.go` -> `service/http.go`) for better code structure.

service/image.go

@@ -8,8 +8,8 @@ import (
 	"image"
 	"io"
 	"net/http"
-	"one-api/common"
 	"one-api/constant"
+	"one-api/logger"
 	"strings"
 
 	"golang.org/x/image/webp"
@@ -113,7 +113,7 @@ func GetImageFromUrl(url string) (mimeType string, data string, err error) {
 func DecodeUrlImageData(imageUrl string) (image.Config, string, error) {
 	response, err := DoDownloadRequest(imageUrl)
 	if err != nil {
-		common.SysLog(fmt.Sprintf("fail to get image from url: %s", err.Error()))
+		logger.SysLog(fmt.Sprintf("fail to get image from url: %s", err.Error()))
 		return image.Config{}, "", err
 	}
 	defer response.Body.Close()
@@ -131,7 +131,7 @@ func DecodeUrlImageData(imageUrl string) (image.Config, string, error) {
 
 	var readData []byte
 	for _, limit := range []int64{1024 * 8, 1024 * 24, 1024 * 64} {
-		common.SysLog(fmt.Sprintf("try to decode image config with limit: %d", limit))
+		logger.SysLog(fmt.Sprintf("try to decode image config with limit: %d", limit))
 
 		// 从response.Body读取更多的数据直到达到当前的限制
 		additionalData := make([]byte, limit-int64(len(readData)))
@@ -157,11 +157,11 @@ func getImageConfig(reader io.Reader) (image.Config, string, error) {
 	config, format, err := image.DecodeConfig(reader)
 	if err != nil {
 		err = errors.New(fmt.Sprintf("fail to decode image config(gif, jpg, png): %s", err.Error()))
-		common.SysLog(err.Error())
+		logger.SysLog(err.Error())
 		config, err = webp.DecodeConfig(reader)
 		if err != nil {
 			err = errors.New(fmt.Sprintf("fail to decode image config(webp): %s", err.Error()))
-			common.SysLog(err.Error())
+			logger.SysLog(err.Error())
 		}
 		format = "webp"
 	}