Serve the app on app.qrmaster.net, marketing on www

Splits the two hostnames across one deployment. No files move: the Next app still
serves every route on both hosts, and the middleware decides per host which paths it
owns and 301s the rest. /login and /signup stay on www - all 82 marketing CTAs point
at /signup, which carries a hard canonical to www plus ad traffic.

src/lib/hosts.ts is the single source of truth for the boundary (APP_PATH_PREFIXES,
isAppPath, wwwUrl, appUrl, urlForPath). The middleware and every absolute-URL builder
read from it so they cannot drift apart.

- Split the overloaded NEXT_PUBLIC_APP_URL into a www and an app origin. It previously
  fed both public URLs and in-app URLs, so any single value was wrong somewhere. Most
  important: QRCodeCard encodes this origin into the QR code the user downloads and
  prints, so it must stay on www.
- Route Stripe return URLs, email links and OAuth redirects per path rather than
  against one origin, so /dashboard lands on app and /pricing on www.
- Cross the host boundary once, after a successful login: the router cannot push across
  origins, so that jump needs a full load. The user arrives signed in because the
  session cookie is scoped to COOKIE_DOMAIN.
- Keep the app host out of search indexes: X-Robots-Tag on every response plus a
  Disallow-all robots.txt via rewrite, and /sitemap.xml redirects to www.
- Point the TikTok callback fallback at www explicitly. It used to read
  NEXT_PUBLIC_APP_URL, whose meaning changed here, and only the apex domain is
  verified with TikTok.

Host splitting is inert while both origins are equal, so development is unaffected.

Verified: tsc clean, production build succeeds including the Edge middleware bundle,
and the path-to-host mapping is unit-checked (prefix traps like /created and
/settings-guide stay on www, query strings do not break matching).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/lib/metaConversions.ts

@@ -1,4 +1,5 @@
 import * as crypto from 'crypto';
+import { getWwwOrigin } from '@/lib/hosts';
 
 const BASE_URL = 'https://graph.facebook.com/v21.0';
 const PIXEL_ID = process.env.META_PIXEL_ID;
@@ -41,7 +42,8 @@ export async function sendConversionEvent(event: ConversionEvent): Promise<void>
       {
         event_name: event.eventName,
         event_time: event.eventTime ?? Math.floor(Date.now() / 1000),
-        event_source_url: event.eventSourceUrl ?? process.env.NEXT_PUBLIC_APP_URL,
+        // Ad attribution happens on the public site, so the fallback is the marketing host.
+        event_source_url: event.eventSourceUrl ?? getWwwOrigin(),
         action_source: 'website',
         user_data: hashedUserData,
         custom_data: event.customData ?? {},