Fix double elimination with byes never finishing; hand-built brackets

Byes now cascade through the whole bracket (a slot nobody can fill is a bye or
a void), re-run on server start so stuck tournaments recover. New manual
bracket builder on the desk: pick round-1 pairings per match. Tests at 5-23
teams for both bracket types. Release 0.5.0.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01MB7nCCAscYsb3zzkT6LHZi

server/routes.js

@@ -170,6 +170,12 @@ export function buildRouter({ registry, auth, store }) {
   action('/broadcast', ({ t, engine, body }) => { const text = String(body.text ?? '').trim().slice(0, 300); if (!text) throw new Error('Nothing to send'); engine.broadcast(text); return 'Broadcast sent'; });
   action('/generate', ({ t, body }) => {
     if (body.what === 'pools') { t.generatePools(+body.poolSize || 4); return `Pools generated: ${t.pools.map(p => `${p.id} (${p.teams.length})`).join(', ')}`; }
+    if (body.what === 'manual') {
+      const pairs = [];
+      for (let i = 1; body[`a${i}`] !== undefined || body[`b${i}`] !== undefined; i++) pairs.push([body[`a${i}`] || null, body[`b${i}`] || null]);
+      const res = t.generateBracketFromPairs(pairs, { type: body.type === 'double' ? 'double' : 'single', thirdPlace: !!body.thirdPlace });
+      return `${body.type === 'double' ? 'Double' : 'Single'} elimination bracket of ${res.size} built from your pairings`;
+    }
     const seeded = t.pools.length ? t.advanceFromPools({ perPool: +body.perPool || 2, wildcards: +body.wildcards || 0 }) : t.activeTeams().map(x => x.id);
     if (seeded.length < 2) throw new Error('Need at least two teams');
     const res = t.generateBracket(seeded, { type: body.type === 'double' ? 'double' : 'single', thirdPlace: !!body.thirdPlace });