feat: 优化Gemini模型版本获取逻辑

relay/channel/gemini/adaptor.go

@@ -6,15 +6,13 @@ import (
 	"github.com/gin-gonic/gin"
 	"io"
 	"net/http"
-	"os"
+	"one-api/constant"
 	"one-api/dto"
 	"one-api/relay/channel"
-	"strings"
 	relaycommon "one-api/relay/common"
 )
 
 type Adaptor struct {
-	modelVersionMap map[string]string
 }
 
 func (a *Adaptor) ConvertAudioRequest(c *gin.Context, info *relaycommon.RelayInfo, request dto.AudioRequest) (io.Reader, error) {
@@ -28,32 +26,12 @@ func (a *Adaptor) ConvertImageRequest(c *gin.Context, info *relaycommon.RelayInf
 }
 
 func (a *Adaptor) Init(info *relaycommon.RelayInfo) {
-	modelVersionMapStr := os.Getenv("GEMINI_MODEL_API")
-	if modelVersionMapStr == "" {
-		a.modelVersionMap = map[string]string{ 
-			"gemini-1.5-pro-latest":   "v1beta",
-			"gemini-1.5-pro-001":      "v1beta",
-			"gemini-1.5-pro":          "v1beta",
-			"gemini-1.5-pro-exp-0801": "v1beta",
-			"gemini-1.5-flash-latest": "v1beta",
-			"gemini-1.5-flash-001":    "v1beta",
-			"gemini-1.5-flash":        "v1beta",
-			"gemini-ultra":            "v1beta",
-		}
-		return
-	}
-	a.modelVersionMap = make(map[string]string) 
-	for _, pair := range strings.Split(modelVersionMapStr, ",") {
-		parts := strings.Split(pair, ":")
-		if len(parts) == 2 {
-			a.modelVersionMap[parts[0]] = parts[1] 
-		}
-	}
+
 }
 
 func (a *Adaptor) GetRequestURL(info *relaycommon.RelayInfo) (string, error) {
 	// 从映射中获取模型名称对应的版本，如果找不到就使用 info.ApiVersion 或默认的版本 "v1"
-	version, beta := a.modelVersionMap[info.UpstreamModelName]
+	version, beta := constant.GeminiModelMap[info.UpstreamModelName]
 	if !beta {
 		if info.ApiVersion != "" {
 			version = info.ApiVersion