refactor: replace console.log/error with structured logger across server

Migrate all server modules to use the centralized logger (lib/logger.ts)
instead of raw console calls. Lint warnings reduced from 74 to 25.
Remaining warnings are only no-floating-promises in game engine code.

Files updated: orchestrator.ts, ranked-queue.ts, human-responses.ts,
payments.ts, fight-loop.ts, app.ts, routes/payments.ts
Files suppressed: logger.ts, fight-loop-cli.ts, migrate.ts (legitimate console use)

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

server/src/routes/payments.ts

@@ -1,5 +1,6 @@
 import { Hono } from 'hono'
 import { nanoid } from 'nanoid'
+import { logger } from '../lib/logger.js'
 import { db, schema } from '../db/index.js'
 import { eq } from 'drizzle-orm'
 import { createEntryInvoice, checkPaymentStatus, redeemCashuToken } from '../engine/payments.js'
@@ -178,7 +179,7 @@ paymentsRouter.post('/confirm/:paymentId', rateLimit(60_000, 20), async (c) => {
     confirmedAt: new Date().toISOString(),
   }).where(eq(schema.payments.id, paymentId))
 
-  console.log(`[payments] payment ${paymentId} confirmed via client (preimage: ${preimage ? 'yes' : 'no'})`)
+  logger.info('payments', `payment ${paymentId} confirmed via client (preimage: ${preimage ? 'yes' : 'no'})`)
   return c.json({ status: 'confirmed' })
 })