Relay Feed search and examples through Network (#819)

ddiff --git a/server/frame/service.js b/server/frame/service.js
iindex 9ed820df..9213a773 100644
---- a/server/frame/service.js
++++ b/server/frame/service.js
@@@ -631,7 +631,10 @@ async function createFrameService(db, config, analytics, { privateKey = null, is
              if (kept && Date.now() - kept.at < 30_000) { res.set('Cache-Control', 'public, max-age=30'); return res.send(kept.body); }
          }
          const d = await getJson(u.href, auth ? { Authorization: auth, Accept: 'application/json' } : { Accept: 'application/json' });
--        const body = JSON.stringify(d && Array.isArray(d.items) ? d : { items: [], next_cursor: null });
++        if (path === '/api/v1/feed/search' && (!d || !Array.isArray(d.items))) return res.status(503).send('{"error":"feed search unavailable"}');
++        const body = JSON.stringify(path === '/api/v1/feed/examples'
++            ? (d && Array.isArray(d.examples) ? d : { examples: [] })
++            : (d && Array.isArray(d.items) ? d : { items: [], next_cursor: null }));
          if (!auth && d) {
              if (relayed.size >= 500) relayed.clear();
              relayed.set(key, { at: Date.now(), body });
@@@ -641,7 +644,7 @@ async function createFrameService(db, config, analytics, { privateKey = null, is
      }
      const qCursor = (v) => (/^[A-Za-z0-9._~=-]{1,300}$/.test(String(v || '')) ? String(v) : '');
      const qLimit = (v, max) => String(Math.min(Math.max(parseInt(v, 10) || 20, 1), max));
--    router.options(['/feed', '/wall', '/status', '/posts', '/attachments'], (req, res) => {
++    router.options(['/feed', '/feed/search', '/feed/examples', '/wall', '/status', '/posts', '/attachments'], (req, res) => {
          res.set({ 'Access-Control-Allow-Origin': '*', 'Access-Control-Allow-Headers': 'Authorization, Content-Type', 'Access-Control-Allow-Methods': 'GET, POST', 'Access-Control-Max-Age': '600' });
          res.status(204).end();
      });
@@@ -696,6 +699,10 @@ async function createFrameService(db, config, analytics, { privateKey = null, is
          following: /^(1|true)$/.test(String(req.query.following || '')) ? '1' : '',
          cursor: qCursor(req.query.cursor), limit: qLimit(req.query.limit, 40),
      }));
++    router.get('/feed/search', (req, res) => relay(req, res, '/api/v1/feed/search', {
++        q: qWords(req.query.q),
++    }));
++    router.get('/feed/examples', (req, res) => relay(req, res, '/api/v1/feed/examples', {}));
      router.get('/wall', (req, res) => relay(req, res, '/api/v1/pulse', {
          limit: qLimit(req.query.limit, 50), after: qCursor(req.query.after), cursor: qCursor(req.query.cursor),
          for: req.query.for === 'me' ? 'me' : '', origin: ['user', 'ai', 'system', 'all'].includes(String(req.query.origin || '')) ? String(req.query.origin) : '',
ddiff --git a/test/frame-feed.test.js b/test/frame-feed.test.js
iindex 54fa51ba..0f51e104 100644
---- a/test/frame-feed.test.js
++++ b/test/frame-feed.test.js
@@@ -16,6 +16,8 @@ const { createFrameService } = require('../server/frame/service');
          res.setHeader('content-type', 'application/json');
          const u = new URL(req.url, 'http://x');
          if (u.pathname === '/api/v1/feed') return res.end(JSON.stringify({ items: [{ id: 'p:1', kind: u.searchParams.get('kind') || 'post', url: 'https://openvibe.community/p/1', title: 'A post' }], next_cursor: 'c2' }));
++        if (u.pathname === '/api/v1/feed/search') return res.end(JSON.stringify({ items: [{ id: 'p:2', title: u.searchParams.get('q') }], next_cursor: null }));
++        if (u.pathname === '/api/v1/feed/examples') return res.end(JSON.stringify({ examples: [{ text: 'New photos', reason: 'kind' }] }));
          if (u.pathname === '/api/v1/me/status' && req.method === 'POST') { let body = ''; req.on('data', (c) => { body += c; }); req.on('end', () => { asked.push({ url: req.url, auth: req.headers.authorization || '', body }); res.statusCode = req.headers.authorization ? 201 : 401; res.end(JSON.stringify({ ok: true })); }); return undefined; }
          if ((u.pathname === '/api/v1/spaces/status/attachments' || u.pathname === '/api/v1/posts') && req.method === 'POST') {
              const chunks = []; req.on('data', (c) => chunks.push(c));
@@@ -42,9 +44,17 @@ const { createFrameService } = require('../server/frame/service');
      assert.strictEqual(d.next_cursor, 'c2');
      const first = new URL(asked[0].url, 'http://x');
      assert.deepStrictEqual([first.pathname, first.searchParams.get('kind'), first.searchParams.get('limit'), first.searchParams.get('cursor')], ['/api/v1/feed', 'clip', '12', 'c1']);
++    ({ r, d } = await get('/feed/search?q=New%20photos'));
++    assert.strictEqual(r.status, 200);
++    assert.strictEqual(d.items[0].title, 'New photos');
++    assert.strictEqual(new URL(asked[asked.length - 1].url, 'http://x').pathname, '/api/v1/feed/search');
++    ({ r, d } = await get('/feed/examples'));
++    assert.strictEqual(r.status, 200);
++    assert.strictEqual(d.examples[0].text, 'New photos');
  
++    const afterSearch = asked.length;
      ({ d } = await get('/feed?kind=clip&limit=12&cursor=c1'));
--    assert.strictEqual(asked.length, 1, 'the same anonymous page within 30 s is answered from memory');
++    assert.strictEqual(asked.length, afterSearch, 'the same anonymous page within 30 s is answered from memory');
  
      ({ r, d } = await get('/wall?limit=20&for=me', { Authorization: 'Bearer abcdefghijklmnop.qrstu', Cookie: 'ov_session=secret' }));
      const wall = asked[asked.length - 1];