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.

setting/ratio_setting/group_ratio.go

@@ -3,7 +3,7 @@ package ratio_setting
 import (
 	"encoding/json"
 	"errors"
-	"one-api/common"
+	"one-api/logger"
 	"sync"
 )
 
@@ -48,7 +48,7 @@ func GroupRatio2JSONString() string {
 
 	jsonBytes, err := json.Marshal(groupRatio)
 	if err != nil {
-		common.SysError("error marshalling model ratio: " + err.Error())
+		logger.SysError("error marshalling model ratio: " + err.Error())
 	}
 	return string(jsonBytes)
 }
@@ -67,7 +67,7 @@ func GetGroupRatio(name string) float64 {
 
 	ratio, ok := groupRatio[name]
 	if !ok {
-		common.SysError("group ratio not found: " + name)
+		logger.SysError("group ratio not found: " + name)
 		return 1
 	}
 	return ratio
@@ -94,7 +94,7 @@ func GroupGroupRatio2JSONString() string {
 
 	jsonBytes, err := json.Marshal(GroupGroupRatio)
 	if err != nil {
-		common.SysError("error marshalling group-group ratio: " + err.Error())
+		logger.SysError("error marshalling group-group ratio: " + err.Error())
 	}
 	return string(jsonBytes)
 }