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/user_notify.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"one-api/common"
 	"one-api/dto"
+	"one-api/logger"
 	"one-api/model"
 	"strings"
 )
@@ -12,7 +13,7 @@ func NotifyRootUser(t string, subject string, content string) {
 	user := model.GetRootUser().ToBaseUser()
 	err := NotifyUser(user.Id, user.Email, user.GetSetting(), dto.NewNotify(t, subject, content, nil))
 	if err != nil {
-		common.SysError(fmt.Sprintf("failed to notify root user: %s", err.Error()))
+		logger.SysError(fmt.Sprintf("failed to notify root user: %s", err.Error()))
 	}
 }
 
@@ -25,7 +26,7 @@ func NotifyUser(userId int, userEmail string, userSetting dto.UserSetting, data
 	// Check notification limit
 	canSend, err := CheckNotificationLimit(userId, data.Type)
 	if err != nil {
-		common.SysError(fmt.Sprintf("failed to check notification limit: %s", err.Error()))
+		logger.SysError(fmt.Sprintf("failed to check notification limit: %s", err.Error()))
 		return err
 	}
 	if !canSend {
@@ -37,14 +38,14 @@ func NotifyUser(userId int, userEmail string, userSetting dto.UserSetting, data
 		// check setting email
 		userEmail = userSetting.NotificationEmail
 		if userEmail == "" {
-			common.SysLog(fmt.Sprintf("user %d has no email, skip sending email", userId))
+			logger.SysLog(fmt.Sprintf("user %d has no email, skip sending email", userId))
 			return nil
 		}
 		return sendEmailNotify(userEmail, data)
 	case dto.NotifyTypeWebhook:
 		webhookURLStr := userSetting.WebhookUrl
 		if webhookURLStr == "" {
-			common.SysError(fmt.Sprintf("user %d has no webhook url, skip sending webhook", userId))
+			logger.SysError(fmt.Sprintf("user %d has no webhook url, skip sending webhook", userId))
 			return nil
 		}