refactor: backend tenant_group 제거 및 관련 정리

backend/internal/utils/env.go

@@ -1,22 +0,0 @@
-package utils
-
-import (
-	"os"
-	"strings"
-)
-
-// GetEnv retrieves the value of the environment variable named by the key.
-// It returns the value if it exists, otherwise it returns the fallback value.
-// It automatically strips surrounding double quotes from the value.
-func GetEnv(key, fallback string) string {
-	v := os.Getenv(key)
-	if v == "" {
-		return fallback
-	}
-	// Strip surrounding double quotes if present
-	v = strings.TrimSpace(v)
-	if len(v) >= 2 && v[0] == '"' && v[len(v)-1] == '"' {
-		return v[1 : len(v)-1]
-	}
-	return v
-}