feat: Handle errors, validate model names, and calculate quota usage (#978)

- Improved error handling in various modules for better stability and responsiveness.
- Optimized code in several files for improved efficiency and readability.
- Enhanced user experience by providing more detailed error responses in the controller.
- Strengthened security by ignoring sensitive files in `.gitignore`.

relay/channel/aiproxy/main.go

@@ -189,5 +189,8 @@ func Handler(c *gin.Context, resp *http.Response) (*openai.ErrorWithStatusCode,
 	c.Writer.Header().Set("Content-Type", "application/json")
 	c.Writer.WriteHeader(resp.StatusCode)
 	_, err = c.Writer.Write(jsonResponse)
+	if err != nil {
+		return openai.ErrorWrapper(err, "write_response_body_failed", http.StatusInternalServerError), nil
+	}
 	return nil, &fullTextResponse.Usage
 }

relay/channel/openai/token.go

@@ -27,7 +27,7 @@ func InitTokenEncoders() {
 	if err != nil {
 		logger.FatalLog(fmt.Sprintf("failed to get gpt-4 token encoder: %s", err.Error()))
 	}
-	for model, _ := range common.ModelRatio {
+	for model := range common.ModelRatio {
 		if strings.HasPrefix(model, "gpt-3.5") {
 			tokenEncoderMap[model] = gpt35TokenEncoder
 		} else if strings.HasPrefix(model, "gpt-4") {

relay/channel/tencent/main.go

@@ -191,6 +191,9 @@ func Handler(c *gin.Context, resp *http.Response) (*openai.ErrorWithStatusCode,
 	c.Writer.Header().Set("Content-Type", "application/json")
 	c.Writer.WriteHeader(resp.StatusCode)
 	_, err = c.Writer.Write(jsonResponse)
+	if err != nil {
+		return openai.ErrorWrapper(err, "write_response_body_failed", http.StatusInternalServerError), nil
+	}
 	return nil, &fullTextResponse.Usage
 }
 
@@ -224,7 +227,7 @@ func GetSign(req ChatRequest, secretKey string) string {
 	messageStr = strings.TrimSuffix(messageStr, ",")
 	params = append(params, "messages=["+messageStr+"]")
 
-	sort.Sort(sort.StringSlice(params))
+	sort.Strings(params)
 	url := "hunyuan.cloud.tencent.com/hyllm/v1/chat/completions?" + strings.Join(params, "&")
 	mac := hmac.New(sha1.New, []byte(secretKey))
 	signURL := url