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.

model/usedata.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"gorm.io/gorm"
 	"one-api/common"
+	"one-api/logger"
 	"sync"
 	"time"
 )
@@ -24,12 +25,12 @@ func UpdateQuotaData() {
 	// recover
 	defer func() {
 		if r := recover(); r != nil {
-			common.SysLog(fmt.Sprintf("UpdateQuotaData panic: %s", r))
+			logger.SysLog(fmt.Sprintf("UpdateQuotaData panic: %s", r))
 		}
 	}()
 	for {
 		if common.DataExportEnabled {
-			common.SysLog("正在更新数据看板数据...")
+			logger.SysLog("正在更新数据看板数据...")
 			SaveQuotaDataCache()
 		}
 		time.Sleep(time.Duration(common.DataExportInterval) * time.Minute)
@@ -91,7 +92,7 @@ func SaveQuotaDataCache() {
 		}
 	}
 	CacheQuotaData = make(map[string]*QuotaData)
-	common.SysLog(fmt.Sprintf("保存数据看板数据成功，共保存%d条数据", size))
+	logger.SysLog(fmt.Sprintf("保存数据看板数据成功，共保存%d条数据", size))
 }
 
 func increaseQuotaData(userId int, username string, modelName string, count int, quota int, createdAt int64, tokenUsed int) {
@@ -102,7 +103,7 @@ func increaseQuotaData(userId int, username string, modelName string, count int,
 		"token_used": gorm.Expr("token_used + ?", tokenUsed),
 	}).Error
 	if err != nil {
-		common.SysLog(fmt.Sprintf("increaseQuotaData error: %s", err))
+		logger.SysLog(fmt.Sprintf("increaseQuotaData error: %s", err))
 	}
 }