add platform demo fam

frontend/src/routes/[fam]/+layout.server.ts

@@ -3,6 +3,7 @@ import { createPbClient } from '$lib/server/pocketbase';
 import { createServices, type ChatActor } from '$lib/server/services';
 import { ensureFamAccess } from '$lib/server/access';
 import { seedDemoCompletions } from '$lib/server/migrate';
+import { getPlatformFlags } from '$lib/server/platform';
 
 async function paydayCheck(famId: string, pbToken: string) {
 	try {
@@ -47,8 +48,8 @@ async function resolveChatIdentity(
 }
 
 export async function load(event) {
-	// Demo family: rotate 3-week completion data on every visit (idempotent).
-	if (event.params.fam === 'showboaters') {
+	// Demo family: rotate 3-week completion data on every visit when demo mode is on (idempotent).
+	if (event.params.fam === 'showboaters' && (await getPlatformFlags()).demo) {
 		seedDemoCompletions().catch(() => {});
 	}
 
@@ -94,6 +95,8 @@ export async function load(event) {
 		}
 	}
 
+	const demoMode = (await getPlatformFlags()).demo;
+
 	return {
 		// Canonical fam slug — from the URL param ([fam] routes). Client code
 		// reads page.data.famSlug; never copy it into local $state.
@@ -117,6 +120,7 @@ export async function load(event) {
 		chat,
 		pbToken,
 		fam,
-		famAccess
+		famAccess,
+		demoMode
 	};
 }