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.

middleware/recover.go

@@ -4,7 +4,7 @@ import (
 	"fmt"
 	"github.com/gin-gonic/gin"
 	"net/http"
-	"one-api/common"
+	"one-api/logger"
 	"runtime/debug"
 )
 
@@ -12,8 +12,8 @@ func RelayPanicRecover() gin.HandlerFunc {
 	return func(c *gin.Context) {
 		defer func() {
 			if err := recover(); err != nil {
-				common.SysError(fmt.Sprintf("panic detected: %v", err))
-				common.SysError(fmt.Sprintf("stacktrace from panic: %s", string(debug.Stack())))
+				logger.SysError(fmt.Sprintf("panic detected: %v", err))
+				logger.SysError(fmt.Sprintf("stacktrace from panic: %s", string(debug.Stack())))
 				c.JSON(http.StatusInternalServerError, gin.H{
 					"error": gin.H{
 						"message": fmt.Sprintf("Panic detected, error: %v. Please submit a issue here: https://github.com/Calcium-Ion/new-api", err),