feat: zap the winner button with lightning animation

Add ZAP WINNER button in FightViewer after fight ends. Server endpoint
POST /api/payments/zap increments zapsReceived on winner bot. Show zap
count on bot profile page. Add zaps_received column with migration.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/routes/payments.ts

@@ -271,3 +271,36 @@ paymentsRouter.delete('/disconnect-wallet', async (c) => {
 
   return c.json({ success: true })
 })
+
+// POST /zap — zap sats to a fight winner
+paymentsRouter.post('/zap', rateLimit(60_000, 10), async (c) => {
+  const { winnerId, fightId, amountSats } = await c.req.json<{
+    winnerId: string
+    fightId: string
+    amountSats: number
+  }>()
+
+  if (!winnerId || !fightId) return c.json({ error: 'Missing winnerId or fightId' }, 400)
+  const amount = amountSats || 21
+
+  // Verify the fight exists and this bot actually won
+  const fightRows = await db.select({
+    winnerId: schema.fights.winnerId,
+    status: schema.fights.status,
+  }).from(schema.fights).where(eq(schema.fights.id, fightId)).limit(1)
+
+  if (fightRows.length === 0) return c.json({ error: 'Fight not found' }, 404)
+  if (fightRows[0].status !== 'finished') return c.json({ error: 'Fight not finished' }, 400)
+  if (fightRows[0].winnerId !== winnerId) return c.json({ error: 'Bot did not win this fight' }, 400)
+
+  // Increment zaps on the winner
+  const botRows = await db.select({ zapsReceived: schema.bots.zapsReceived })
+    .from(schema.bots).where(eq(schema.bots.id, winnerId)).limit(1)
+  if (botRows.length === 0) return c.json({ error: 'Bot not found' }, 404)
+
+  await db.update(schema.bots).set({
+    zapsReceived: (botRows[0].zapsReceived || 0) + 1,
+  }).where(eq(schema.bots.id, winnerId))
+
+  return c.json({ ok: true, zapsReceived: (botRows[0].zapsReceived || 0) + 1 })
+})