feat: update callback handler and repository for user

backend/internal/auth/jwt.go

@@ -14,9 +14,9 @@ var jwtSecret = []byte(os.Getenv("JWT_SECRET"))
 
 func GenerateJWT(user storage.User) (string, error) {
 	token := jwt.NewWithClaims(jwt.SigningMethodHS512, jwt.MapClaims{
-		"id":    user.ID,
-		"email": user.Email,
-		"login": user.GithubLogin,
+		"id":        user.ID,
+		"email":     user.Email,
+		"github_id": user.GithubID,
 	})
 	tokenString, err := token.SignedString(jwtSecret)
 	if err != nil {