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/startup.ts

@@ -58,6 +58,34 @@ export function runMigrations() {
     );
   `)
 
+  sqlite.exec(`
+    CREATE TABLE IF NOT EXISTS payments (
+      id TEXT PRIMARY KEY,
+      fight_id TEXT REFERENCES fights(id),
+      bot_id TEXT NOT NULL REFERENCES bots(id),
+      direction TEXT NOT NULL,
+      amount_sats INTEGER NOT NULL,
+      method TEXT NOT NULL,
+      status TEXT NOT NULL DEFAULT 'pending',
+      invoice TEXT,
+      preimage TEXT,
+      cashu_token TEXT,
+      error_reason TEXT,
+      created_at TEXT NOT NULL,
+      confirmed_at TEXT,
+      refunded_at TEXT
+    );
+
+    CREATE TABLE IF NOT EXISTS wallet_connections (
+      id TEXT PRIMARY KEY,
+      bot_id TEXT NOT NULL UNIQUE REFERENCES bots(id),
+      method TEXT NOT NULL,
+      connection_data TEXT NOT NULL,
+      created_at TEXT NOT NULL,
+      last_used_at TEXT
+    );
+  `)
+
   // Column migrations for existing databases
   const migrations = [
     "ALTER TABLE bots ADD COLUMN archetype TEXT NOT NULL DEFAULT 'standard'",
@@ -66,6 +94,14 @@ export function runMigrations() {
     "ALTER TABLE bots ADD COLUMN consecutive_errors INTEGER NOT NULL DEFAULT 0",
     "ALTER TABLE bots ADD COLUMN last_error_at TEXT",
     "ALTER TABLE bots ADD COLUMN customization TEXT",
+    // Ranked fights columns
+    "ALTER TABLE fights ADD COLUMN mode TEXT NOT NULL DEFAULT 'free'",
+    "ALTER TABLE fights ADD COLUMN pot_sats INTEGER NOT NULL DEFAULT 0",
+    "ALTER TABLE fights ADD COLUMN payout_status TEXT",
+    // Bot sats tracking
+    "ALTER TABLE bots ADD COLUMN sats_won INTEGER NOT NULL DEFAULT 0",
+    "ALTER TABLE bots ADD COLUMN sats_wagered INTEGER NOT NULL DEFAULT 0",
+    "ALTER TABLE bots ADD COLUMN has_wallet INTEGER NOT NULL DEFAULT 0",
   ]
 
   for (const sql of migrations) {