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/utils.go

@@ -3,6 +3,7 @@ package model
 import (
 	"errors"
 	"one-api/common"
+	"one-api/logger"
 	"sync"
 	"time"
 
@@ -65,7 +66,7 @@ func batchUpdate() {
 		return
 	}
 
-	common.SysLog("batch update started")
+	logger.SysLog("batch update started")
 	for i := 0; i < BatchUpdateTypeCount; i++ {
 		batchUpdateLocks[i].Lock()
 		store := batchUpdateStores[i]
@@ -77,12 +78,12 @@ func batchUpdate() {
 			case BatchUpdateTypeUserQuota:
 				err := increaseUserQuota(key, value)
 				if err != nil {
-					common.SysError("failed to batch update user quota: " + err.Error())
+					logger.SysError("failed to batch update user quota: " + err.Error())
 				}
 			case BatchUpdateTypeTokenQuota:
 				err := increaseTokenQuota(key, value)
 				if err != nil {
-					common.SysError("failed to batch update token quota: " + err.Error())
+					logger.SysError("failed to batch update token quota: " + err.Error())
 				}
 			case BatchUpdateTypeUsedQuota:
 				updateUserUsedQuota(key, value)
@@ -93,7 +94,7 @@ func batchUpdate() {
 			}
 		}
 	}
-	common.SysLog("batch update finished")
+	logger.SysLog("batch update finished")
 }
 
 func RecordExist(err error) (bool, error) {