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.

controller/user.go

@@ -7,6 +7,7 @@ import (
 	"net/url"
 	"one-api/common"
 	"one-api/dto"
+	"one-api/logger"
 	"one-api/model"
 	"one-api/setting"
 	"strconv"
@@ -192,7 +193,7 @@ func Register(c *gin.Context) {
 			"success": false,
 			"message": "数据库错误，请稍后重试",
 		})
-		common.SysError(fmt.Sprintf("CheckUserExistOrDeleted error: %v", err))
+		logger.SysError(fmt.Sprintf("CheckUserExistOrDeleted error: %v", err))
 		return
 	}
 	if exist {
@@ -235,7 +236,7 @@ func Register(c *gin.Context) {
 				"success": false,
 				"message": "生成默认令牌失败",
 			})
-			common.SysError("failed to generate token key: " + err.Error())
+			logger.SysError("failed to generate token key: " + err.Error())
 			return
 		}
 		// 生成默认令牌
@@ -342,7 +343,7 @@ func GenerateAccessToken(c *gin.Context) {
 			"success": false,
 			"message": "生成失败",
 		})
-		common.SysError("failed to generate key: " + err.Error())
+		logger.SysError("failed to generate key: " + err.Error())
 		return
 	}
 	user.SetAccessToken(key)
@@ -517,7 +518,7 @@ func UpdateUser(c *gin.Context) {
 		return
 	}
 	if originUser.Quota != updatedUser.Quota {
-		model.RecordLog(originUser.Id, model.LogTypeManage, fmt.Sprintf("管理员将用户额度从 %s修改为 %s", common.LogQuota(originUser.Quota), common.LogQuota(updatedUser.Quota)))
+		model.RecordLog(originUser.Id, model.LogTypeManage, fmt.Sprintf("管理员将用户额度从 %s修改为 %s", logger.LogQuota(originUser.Quota), logger.LogQuota(updatedUser.Quota)))
 	}
 	c.JSON(http.StatusOK, gin.H{
 		"success": true,