docs: add system architecture documentation

app/dashboard/page.tsx

@@ -50,7 +50,7 @@ export default async function DashboardPage() {
     supabase
       .from("plesk_domains")
       .select(
-        "id, plesk_instance_id, subscription_id, status, domain_name, hosting_type, source_created_at, aliases_count, updated_at, subscription:plesk_subscriptions(status)",
+        "id, plesk_instance_id, subscription_id, domain_name, status, hosting_type, source_created_at, aliases_count, updated_at",
       )
       .eq("agency_id", context.agencyId)
       .order("updated_at", { ascending: false })
@@ -107,9 +107,6 @@ export default async function DashboardPage() {
         source_created_at: string | null;
         aliases_count: number | null;
         updated_at: string;
-        subscription: {
-          status: string | null;
-        } | null;
       }> | null;
     },
     { data: BillingSummary | null },
@@ -170,16 +167,7 @@ export default async function DashboardPage() {
       <DashboardControls
         instances={instances ?? []}
         subscriptions={subscriptions ?? []}
-        domains={(domains ?? []).map((domain) => {
+        domains={domains ?? []}
-          const joinedStatus = Array.isArray(domain.subscription)
-            ? domain.subscription[0]?.status
-            : domain.subscription?.status;
-
-          return {
-            ...domain,
-            status: joinedStatus ?? "unknown",
-          };
-        })}
         autoSyncByInstance={Object.fromEntries(autoSyncByInstance.entries())}
       />
     </main>