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.

relay/channel/cloudflare/relay_cloudflare.go

@@ -5,8 +5,8 @@ import (
 	"encoding/json"
 	"io"
 	"net/http"
-	"one-api/common"
 	"one-api/dto"
+	"one-api/logger"
 	relaycommon "one-api/relay/common"
 	"one-api/relay/helper"
 	"one-api/service"
@@ -51,7 +51,7 @@ func cfStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Res
 		var response dto.ChatCompletionsStreamResponse
 		err := json.Unmarshal([]byte(data), &response)
 		if err != nil {
-			common.LogError(c, "error_unmarshalling_stream_response: "+err.Error())
+			logger.LogError(c, "error_unmarshalling_stream_response: "+err.Error())
 			continue
 		}
 		for _, choice := range response.Choices {
@@ -66,24 +66,24 @@ func cfStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Res
 			info.FirstResponseTime = time.Now()
 		}
 		if err != nil {
-			common.LogError(c, "error_rendering_stream_response: "+err.Error())
+			logger.LogError(c, "error_rendering_stream_response: "+err.Error())
 		}
 	}
 
 	if err := scanner.Err(); err != nil {
-		common.LogError(c, "error_scanning_stream_response: "+err.Error())
+		logger.LogError(c, "error_scanning_stream_response: "+err.Error())
 	}
 	usage := service.ResponseText2Usage(responseText, info.UpstreamModelName, info.PromptTokens)
 	if info.ShouldIncludeUsage {
 		response := helper.GenerateFinalUsageResponse(id, info.StartTime.Unix(), info.UpstreamModelName, *usage)
 		err := helper.ObjectData(c, response)
 		if err != nil {
-			common.LogError(c, "error_rendering_final_usage_response: "+err.Error())
+			logger.LogError(c, "error_rendering_final_usage_response: "+err.Error())
 		}
 	}
 	helper.Done(c)
 
-	common.CloseResponseBodyGracefully(resp)
+	service.CloseResponseBodyGracefully(resp)
 
 	return nil, usage
 }
@@ -93,7 +93,7 @@ func cfHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Response)
 	if err != nil {
 		return types.NewError(err, types.ErrorCodeBadResponseBody), nil
 	}
-	common.CloseResponseBodyGracefully(resp)
+	service.CloseResponseBodyGracefully(resp)
 	var response dto.TextResponse
 	err = json.Unmarshal(responseBody, &response)
 	if err != nil {
@@ -123,7 +123,7 @@ func cfSTTHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Respon
 	if err != nil {
 		return types.NewError(err, types.ErrorCodeBadResponseBody), nil
 	}
-	common.CloseResponseBodyGracefully(resp)
+	service.CloseResponseBodyGracefully(resp)
 	err = json.Unmarshal(responseBody, &cfResp)
 	if err != nil {
 		return types.NewError(err, types.ErrorCodeBadResponseBody), nil