Mark Report's tables as an open Dataset in JSON-LD (#147)

ddiff --git a/server/views/index.js b/server/views/index.js
iindex f5c9d75..ae85a34 100644
---- a/server/views/index.js
++++ b/server/views/index.js
@@@ -22,6 +22,23 @@ const rooms = require('openvibe-shared/rooms');
  const { asset } = require('../assets');
  
  const NAME = 'OpenVibe.Report';
++
++// The tables are an open dataset, not only a page: Dataset JSON-LD names the numbers and the JSON that serves them, so
++// dataset search and AI retrieval can cite Report's tables instead of re-deriving them from prose.
++function networkDataset() {
++    return seo.jsonLd.dataset({
++        name: 'OpenVibe network numbers',
++        url: 'https://openvibe.report/stats',
++        description: 'Page views, visitors, live streams, chat, OpenCoins and service speed across every OpenVibe site, counted by the sites themselves and published as open JSON.',
++        creator: 'OpenVibe',
++        keywords: ['OpenVibe', 'web analytics', 'live streaming', 'page views', 'service status', 'open data'],
++        distribution: [
++            { '@type': 'DataDownload', name: 'Network numbers', contentUrl: 'https://openvibe.report/api/v1/stats', encodingFormat: 'application/json' },
++            { '@type': 'DataDownload', name: 'AI results and cost per task', contentUrl: 'https://openvibe.report/api/v1/ai/results', encodingFormat: 'application/json' },
++            { '@type': 'DataDownload', name: 'The Rundown topics', contentUrl: 'https://openvibe.report/api/v1/rundown/topics', encodingFormat: 'application/json' },
++        ],
++    });
++}
  const NETWORK = 'https://openvibe.network';
  const LIVE = 'https://openvibe.live';
  const BENCH = 'https://bench.openvibe.services';
@@@ -273,7 +290,7 @@ function home({ stats, rundown, topics } = {}) {
      out = foldAround(out, '>Questions</h2>', 'faq', '<h2 id="rp-faq-h">Questions</h2>');
      return layout({
          title: null, body: out, active: '/', path: '/', agent: true,
--        jsonLd: [seo.jsonLd.website({ name: 'OpenVibe.Report', url: 'https://openvibe.report/', description: "The network's numbers open to everyone, what streamers talked about in The Rundown, and every stream's after-show report." }), seo.jsonLd.organization()],
++        jsonLd: [seo.jsonLd.website({ name: 'OpenVibe.Report', url: 'https://openvibe.report/', description: "The network's numbers open to everyone, what streamers talked about in The Rundown, and every stream's after-show report." }), seo.jsonLd.organization(), networkDataset()],
          // The rule that shows the picked topic of the pick list: one per topic, written for this page.
      });
  }
@@@ -302,7 +319,7 @@ ${sites ? `<section aria-labelledby="rp-sites-h"><h2 id="rp-sites-h">Every site<
  ${L ? `<section aria-labelledby="rp-live-h"><h2 id="rp-live-h">OpenVibe.Live</h2><div class="rp-minis">${[['Streamers', L.streamers], ['Streams', L.streams], ['Hours watched', L.hours_watched], ['Chat messages', L.messages], ['Recordings', L.vods], ['Clips', L.clips], ['AI moments', L.ai_moments]].filter(([, v]) => n(v)).map(([l, v]) => `<div><b>${fmt(v)}</b><span>${esc(l)}</span></div>`).join('')}</div></section>` : ''}
  ${A && A.daily && A.daily.length > 1 ? `<section aria-labelledby="rp-acc-h"><h2 id="rp-acc-h">New accounts a day</h2>${bars(A.daily, 'New accounts a day', { h: 110 })}</section>` : ''}
  <section aria-labelledby="rp-how-h"><h2 id="rp-how-h">How these are counted</h2><p class="rp-fine">${esc(d.note || '')} The same numbers: <a href="/api/v1/stats?days=${esc(days)}"><code>/api/v1/stats</code></a>. How closely each site follows the design kit, read from its code: <a href="/design">Design health</a>.</p></section>`;
--    return layout({ title: `Every site's numbers, ${days} days`, description: 'Page views, people, streams and how fast each OpenVibe service answers, open to everyone.', body, active: '/stats', path: `/stats${Number(days) === 30 ? '' : `?days=${Number(days)}`}`, agent: true });
++    return layout({ title: `Every site's numbers, ${days} days`, description: 'Page views, people, streams and how fast each OpenVibe service answers, open to everyone.', body, active: '/stats', path: `/stats${Number(days) === 30 ? '' : `?days=${Number(days)}`}`, agent: true, jsonLd: [networkDataset()] });
  }
  
  function rundown({ rundown: R = {}, topics, reports } = {}) {
ddiff --git a/test/pages.test.js b/test/pages.test.js
iindex 8bd6c54..38e71ee 100644
---- a/test/pages.test.js
++++ b/test/pages.test.js
@@@ -70,6 +70,19 @@ const { boot, check, done, defaults } = require('./helpers/boot');
              assert.ok(org && Array.isArray(org.sameAs) && org.sameAs.includes('https://github.com/OpenVibers'), 'Organization');
          });
  
++        await check('the home and the stats page carry Dataset JSON-LD with the JSON endpoints', async () => {
++            for (const path of ['/', '/stats']) {
++                const r = await t.get(path);
++                const ld = [...r.text.matchAll(/<script type="application\/ld\+json">([\s\S]*?)<\/script>/g)].map((m) => JSON.parse(m[1])).flatMap((b) => b['@graph'] || [b]);
++                const dataset = ld.find((x) => x['@type'] === 'Dataset');
++                assert.ok(dataset, `${path}: Dataset`);
++                assert.strictEqual(dataset.url, 'https://openvibe.report/stats', `${path}: Dataset url`);
++                const urls = (dataset.distribution || []).map((d) => d.contentUrl);
++                assert.ok(urls.includes('https://openvibe.report/api/v1/stats'), `${path}: stats JSON`);
++                assert.ok(urls.includes('https://openvibe.report/api/v1/ai/results'), `${path}: AI JSON`);
++            }
++        });
++
          await check('The Rundown pages name OpenVibe.Live as canonical and mount the Frame for service report', async () => {
              const r = await t.get('/rundown/t/seattle');
              assert.ok(r.text.includes('<link rel="canonical" href="https://openvibe.live/rundown/t/seattle">'), 'the topic is Live\'s page');