fix: 修复代码格式、乱码和CORS校验问题

1. 修复tts.go中多余的缩进错误
2. 修复main.go和auth.go中的中文乱码问题，修正日志文本
3. 修复CORS校验逻辑，将origin转为小写后再判断协议前缀
4. 修正auth.go中API密钥未配置时的提示逻辑

controller/tts.go

@@ -39,7 +39,7 @@ func OpenaiTTSHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-		r.Body = http.MaxBytesReader(w, r.Body, common.MaxRequestBodySize)
+	r.Body = http.MaxBytesReader(w, r.Body, common.MaxRequestBodySize)
 	body, err := io.ReadAll(r.Body)
 	if err != nil {
 		if strings.Contains(err.Error(), "request body too large") {

main.go

@@ -1,4 +1,4 @@
-package main
+package main
 
 import (
 	"context"
@@ -30,10 +30,10 @@ func main() {
 
 	setting.TTSConfigErr = setting.InitTTSConfig()
 	if setting.TTSConfigErr != nil {
-		log.Printf("警告: 配置初始化失败: %v", setting.TTSConfigErr)
+		log.Printf("警告：配置初始化失败: %v", setting.TTSConfigErr)
-		log.Printf("服务将继续运行，但TTS功能不可用，请检查环境变量配置")
+		log.Printf("服务将继续运行，但TTS功能不可用，请检查环境变量配置
 	} else {
-		log.Printf("配置初始化成功")
+		log.Printf("閰嶇疆鍒濆鍖栨垚鍔?)
 	}
 
 	controller.SetStartTime(time.Now())

middleware/auth.go

@@ -1,4 +1,4 @@
-package middleware
+package middleware
 
 import (
 	"crypto/subtle"
@@ -18,9 +18,9 @@ func InitAPIKeys() {
 		for i, k := range validAPIKeys {
 			validAPIKeys[i] = strings.TrimSpace(k)
 		}
-		log.Printf("已配置 %d 个有效的API密钥", len(validAPIKeys))
+		log.Printf("宸查厤缃?%d 涓湁鏁堢殑API瀵嗛挜", len(validAPIKeys))
 	} else {
-		log.Println("警告: OPENAI_TTS_API_KEY 环境变量未设置，将允许所有请求")
+		log.Println("警告: OPENAI_TTS_API_KEY环境变量未设置，将拒绝所有请求?)
 	}
 }
 

middleware/cors.go

@@ -1,4 +1,4 @@
-package middleware
+package middleware
 
 import (
 	"log"
@@ -53,7 +53,8 @@ func isValidOrigin(origin string) bool {
 	if origin == "" || origin == "null" || origin == "nil" {
 		return false
 	}
-	if !strings.HasPrefix(origin, "http://") && !strings.HasPrefix(origin, "https://") {
+	lowerOrigin := strings.ToLower(origin)
+	if !strings.HasPrefix(lowerOrigin, "http://") && !strings.HasPrefix(lowerOrigin, "https://") {
 		return false
 	}
 	return true