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.

dto/audio.go

@@ -1,5 +1,11 @@
 package dto
 
+import (
+	"one-api/types"
+
+	"github.com/gin-gonic/gin"
+)
+
 type AudioRequest struct {
 	Model          string  `json:"model"`
 	Input          string  `json:"input"`
@@ -8,6 +14,18 @@ type AudioRequest struct {
 	ResponseFormat string  `json:"response_format,omitempty"`
 }
 
+func (r *AudioRequest) GetTokenCountMeta() *types.TokenCountMeta {
+	meta := &types.TokenCountMeta{
+		CombineText: r.Input,
+		TokenType:   types.TokenTypeTextNumber,
+	}
+	return meta
+}
+
+func (r *AudioRequest) IsStream(c *gin.Context) bool {
+	return false
+}
+
 type AudioResponse struct {
 	Text string `json:"text"`
 }