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/db/schema.ts

@@ -23,6 +23,7 @@ export const bots = sqliteTable('bots', {
   satsWon: integer('sats_won').notNull().default(0),
   satsWagered: integer('sats_wagered').notNull().default(0),
   hasWallet: integer('has_wallet', { mode: 'boolean' }).notNull().default(false),
+  zapsReceived: integer('zaps_received').notNull().default(0),
   botType: text('bot_type', { enum: ['regular', 'mock', 'classic'] }).notNull().default('regular'),
   createdAt: text('created_at').notNull(),
 })