feat: implement internal auth user creation and update related functionalities

lib/supabase/admin.ts

@@ -0,0 +1,18 @@
+import { createClient } from "@supabase/supabase-js";
+
+export function createServiceRoleClient() {
+  const supabaseUrl =
+    process.env.SUPABASE_INTERNAL_URL || process.env.NEXT_PUBLIC_SUPABASE_URL;
+  const serviceRoleKey = process.env.SUPABASE_SERVICE_ROLE_KEY;
+
+  if (!supabaseUrl || !serviceRoleKey) {
+    throw new Error("Supabase service role yapılandırması eksik.");
+  }
+
+  return createClient(supabaseUrl, serviceRoleKey, {
+    auth: {
+      autoRefreshToken: false,
+      persistSession: false,
+    },
+  });
+}