Tell search engines and link previews what each page is

- /sitemap.xml, from the API's /slugs plus the landing and listings:
  every address in every language, with hreflang and x-default. A 503
  when the API is down, rather than a sitemap missing half the site.
- /robots.txt, naming the sitemap on whatever domain this is served on.
- Slugs renamed in the panel now redirect. The API has always kept the
  old address the moment one changed; middleware/redirects.ts answers
  it with a 301, from a list kept for a minute and through outages.
- og:url, og:image (the record's own picture, the logo otherwise) and
  schema.org JSON-LD: Organization on the landing; WebPage,
  CreativeWork, Person or Service elsewhere. Shared through core/head.
- The proxy-derived origin moves to core/origin.ts, used by the page
  shell, the landing and both server routes.

In development only /api/* reaches Nitro, so the two files 404 under
`npm start`; they were checked against a production build.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

landing/src/app/ui/routed-page.ts

@@ -7,6 +7,7 @@ import {
 
 import { copyFor, type Copy } from '../core/copy';
 import { listingAlternates, listingPath } from '../core/routes';
+import { memberLinks } from './member-card';
 import type { Locale } from '../core/api';
 import { RadarPage } from './radar-page';
 import { ServiceDetail } from './service-detail';
@@ -121,6 +122,13 @@ export function seoFor(
         path: page.path,
         alternates: page.alternates ?? {},
         type: 'article',
+        image: page.featured_image?.url,
+        jsonLd: {
+          '@type': 'WebPage',
+          name: page.title,
+          description: page.excerpt,
+          inLanguage: page.locale,
+        },
       };
     }
     case 'project': {
@@ -132,6 +140,26 @@ export function seoFor(
         path: project.path,
         alternates: project.alternates ?? {},
         type: 'article',
+        image: project.cover_image?.url,
+        jsonLd: {
+          '@type': 'CreativeWork',
+          name: project.title,
+          description: project.tagline,
+          inLanguage: project.locale,
+          dateCreated: project.started_at,
+          dateModified: project.updated_at,
+          keywords:
+            (project.technologies ?? [])
+              .map((technology) => technology.name)
+              .join(', ') || undefined,
+          creator: (project.members ?? []).map((member) => ({
+            '@type': 'Person',
+            name: member.name,
+          })),
+          ...(project.client
+            ? { funder: { '@type': 'Organization', name: project.client.name } }
+            : {}),
+        },
       };
     }
     case 'member': {
@@ -143,6 +171,16 @@ export function seoFor(
         path: member.path,
         alternates: member.alternates ?? {},
         type: 'profile',
+        image: member.avatar?.url,
+        jsonLd: {
+          '@type': 'Person',
+          name: member.name,
+          jobTitle: member.headline,
+          description: member.bio,
+          image: member.avatar?.url,
+          sameAs: memberLinks(member).map((link) => link.url),
+          memberOf: { '@type': 'Organization', name: 'Pireon' },
+        },
       };
     }
     case 'service': {
@@ -154,6 +192,12 @@ export function seoFor(
         path: service.path,
         alternates: service.alternates ?? {},
         type: 'article',
+        jsonLd: {
+          '@type': 'Service',
+          name: service.title,
+          description: service.tagline,
+          provider: { '@type': 'Organization', name: 'Pireon' },
+        },
       };
     }
     case 'contribute':
@@ -163,6 +207,11 @@ export function seoFor(
         path: listingPath('contribute', locale),
         alternates: listingAlternates('contribute'),
         type: 'website',
+        jsonLd: {
+          '@type': 'WebPage',
+          name: copy.contribute.title,
+          description: copy.contribute.lead,
+        },
       };
     case 'radar':
       return {
@@ -171,6 +220,11 @@ export function seoFor(
         path: listingPath('radar', locale),
         alternates: listingAlternates('radar'),
         type: 'website',
+        jsonLd: {
+          '@type': 'WebPage',
+          name: copy.sections.radar.title,
+          description: copy.radar.lead,
+        },
       };
     case 'call': {
       const call = found.record;
@@ -182,6 +236,12 @@ export function seoFor(
         path: call.path,
         alternates: call.alternates ?? {},
         type: 'article',
+        image: call.project?.cover_image?.url,
+        jsonLd: {
+          '@type': 'WebPage',
+          name: call.title,
+          description: call.description,
+        },
       };
     }
   }