refactor: Update authentication and remove unnecessary imports

- Replace ClientID, ClientSecret, and RedirectURL with actual values in module/gmail.go
- Remove `log` import, `godotenv` initialization, `log.Fatal` line, and `cors` import from main.go
- Change `zap` import to `go.uber.org/zap` in main.go

main.go

@@ -3,7 +3,6 @@ package main
 import (
 	"encoding/base64"
 	"fmt"
-	"log"
 	"net/http"
 	"net/url"
 	"strings"
@@ -12,21 +11,13 @@ import (
 	"github.com/KNN3-Network/oauth-server/utils"
 	"github.com/gin-contrib/cors"
 	"github.com/gin-gonic/gin"
-	"github.com/joho/godotenv"
 	"go.uber.org/zap"
 )
 
 var logger = utils.Logger
 
 var stackoverflow = new(module.Stackoverflow)
 
-func init() {
-	err := godotenv.Load()
-	if err != nil {
-		log.Fatal("Error loading .env file")
-	}
-}
-
 func main() {
 
 	r := gin.Default()

module/gmail.go

@@ -26,10 +26,9 @@ func init() {
 	// 	log.Fatal("Error loading .env file")
 	// }
 	oauthConfig = &oauth2.Config{
-		ClientID:     os.Getenv("GMAIL_ID"),     // 替换为实际的客户端ID
-		ClientSecret: os.Getenv("GMAIL_SECRET"), // 替换为实际的客户端密钥
-		// RedirectURL:  "https://knn3-gateway.knn3.xyz/oauth/gmail", // 替换为实际的回调URL
-		RedirectURL: "https://knn3-gateway.knn3.xyz/oauth/gmail", // 替换为实际的回调URL
+		ClientID:     os.Getenv("GMAIL_ID"),                       // 替换为实际的客户端ID
+		ClientSecret: os.Getenv("GMAIL_SECRET"),                   // 替换为实际的客户端密钥
+		RedirectURL:  "https://knn3-gateway.knn3.xyz/oauth/gmail", // 替换为实际的回调URL
 		Scopes: []string{
 			gmail.GmailReadonlyScope,
 		},