feat: payments schema + deps for Lightning ranked fights

Add payments and wallet_connections tables, new columns on fights (mode,
pot_sats, payout_status) and bots (sats_won, sats_wagered, has_wallet).
Install nostr-tools and @cashu/cashu-ts for NWC + ecash support.

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

server/src/db/schema.ts

@@ -20,6 +20,9 @@ export const bots = sqliteTable('bots', {
   consecutiveErrors: integer('consecutive_errors').notNull().default(0),
   lastErrorAt: text('last_error_at'),
   customization: text('customization'),
+  satsWon: integer('sats_won').notNull().default(0),
+  satsWagered: integer('sats_wagered').notNull().default(0),
+  hasWallet: integer('has_wallet', { mode: 'boolean' }).notNull().default(false),
   createdAt: text('created_at').notNull(),
 })
 
@@ -36,6 +39,9 @@ export const fights = sqliteTable('fights', {
   scheduledAt: text('scheduled_at'),
   startedAt: text('started_at'),
   endedAt: text('ended_at'),
+  mode: text('mode', { enum: ['free', 'ranked'] }).notNull().default('free'),
+  potSats: integer('pot_sats').notNull().default(0),
+  payoutStatus: text('payout_status', { enum: ['pending', 'paid', 'failed'] }),
   createdAt: text('created_at').notNull(),
 })
 
@@ -56,6 +62,34 @@ export const rounds = sqliteTable('rounds', {
   createdAt: text('created_at').notNull(),
 })
 
+export const payments = sqliteTable('payments', {
+  id: text('id').primaryKey(),
+  fightId: text('fight_id').references(() => fights.id),
+  botId: text('bot_id').notNull().references(() => bots.id),
+  direction: text('direction', { enum: ['in', 'out'] }).notNull(),
+  amountSats: integer('amount_sats').notNull(),
+  method: text('method', { enum: ['lightning', 'cashu'] }).notNull(),
+  status: text('status', {
+    enum: ['pending', 'confirmed', 'failed', 'refunded'],
+  }).notNull().default('pending'),
+  invoice: text('invoice'),
+  preimage: text('preimage'),
+  cashuToken: text('cashu_token'),
+  errorReason: text('error_reason'),
+  createdAt: text('created_at').notNull(),
+  confirmedAt: text('confirmed_at'),
+  refundedAt: text('refunded_at'),
+})
+
+export const walletConnections = sqliteTable('wallet_connections', {
+  id: text('id').primaryKey(),
+  botId: text('bot_id').notNull().unique().references(() => bots.id),
+  method: text('method', { enum: ['nwc', 'lnaddress', 'cashu_mint'] }).notNull(),
+  connectionData: text('connection_data').notNull(),
+  createdAt: text('created_at').notNull(),
+  lastUsedAt: text('last_used_at'),
+})
+
 export const bets = sqliteTable('bets', {
   id: text('id').primaryKey(),
   fightId: text('fight_id').notNull().references(() => fights.id),