init: kovakemlak-crm project scaffold

- Next.js 16 + Appwrite multi-tenant emlak CRM
- Database: kovakemlak-db (properties, customers, customer_searches, property_matches, presentations, investors, activities, tenant_settings)
- Same stack as isletmem-kovakcrm (shadcn/ui template base)
- Modules: portföy, müşteri takibi, arama kriterleri, otomatik eşleştirme, sunum linki, yatırımcı portalı

src/app/(auth)/sign-in/page.tsx

@@ -0,0 +1,22 @@
+import { redirect } from "next/navigation";
+
+import { LoginForm1 } from "./components/login-form-1";
+import { getCurrentUser } from "@/lib/appwrite/server";
+
+export default async function Page({
+  searchParams,
+}: {
+  searchParams: Promise<{ invite?: string }>;
+}) {
+  const { invite } = await searchParams;
+  const user = await getCurrentUser();
+  if (user) redirect(invite ? `/d/${invite}` : "/dashboard");
+
+  return (
+    <div className="bg-muted flex min-h-svh flex-col items-center justify-center p-6 md:p-10">
+      <div className="w-full max-w-sm md:max-w-4xl">
+        <LoginForm1 inviteCode={invite} />
+      </div>
+    </div>
+  );
+}