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/tencent/relay-tencent.go

@@ -13,6 +13,7 @@ import (
 	"one-api/common"
 	"one-api/constant"
 	"one-api/dto"
+	"one-api/logger"
 	relaycommon "one-api/relay/common"
 	"one-api/relay/helper"
 	"one-api/service"
@@ -106,7 +107,7 @@ func tencentStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *htt
 		var tencentResponse TencentChatResponse
 		err := json.Unmarshal([]byte(data), &tencentResponse)
 		if err != nil {
-			common.SysError("error unmarshalling stream response: " + err.Error())
+			logger.SysError("error unmarshalling stream response: " + err.Error())
 			continue
 		}
 
@@ -117,17 +118,17 @@ func tencentStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *htt
 
 		err = helper.ObjectData(c, response)
 		if err != nil {
-			common.SysError(err.Error())
+			logger.SysError(err.Error())
 		}
 	}
 
 	if err := scanner.Err(); err != nil {
-		common.SysError("error reading stream: " + err.Error())
+		logger.SysError("error reading stream: " + err.Error())
 	}
 
 	helper.Done(c)
 
-	common.CloseResponseBodyGracefully(resp)
+	service.CloseResponseBodyGracefully(resp)
 
 	return service.ResponseText2Usage(responseText, info.UpstreamModelName, info.PromptTokens), nil
 }
@@ -138,7 +139,7 @@ func tencentHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Resp
 	if err != nil {
 		return nil, types.NewOpenAIError(err, types.ErrorCodeReadResponseBodyFailed, http.StatusInternalServerError)
 	}
-	common.CloseResponseBodyGracefully(resp)
+	service.CloseResponseBodyGracefully(resp)
 	err = json.Unmarshal(responseBody, &tencentSb)
 	if err != nil {
 		return nil, types.NewOpenAIError(err, types.ErrorCodeBadResponseBody, http.StatusInternalServerError)
@@ -156,7 +157,7 @@ func tencentHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Resp
 	}
 	c.Writer.Header().Set("Content-Type", "application/json")
 	c.Writer.WriteHeader(resp.StatusCode)
-	common.IOCopyBytesGracefully(c, resp, jsonResponse)
+	service.IOCopyBytesGracefully(c, resp, jsonResponse)
 	return &fullTextResponse.Usage, nil
 }