chore: clean up unused code and fix test imports

- Remove unused config in commands.ts
- Remove deprecated formatDepositResult function in deposit-tool.ts
- Remove unused type imports in deposit-tool.ts
- Fix import path in deposit-agent.test.ts (src/deposit-agent → src/agents/deposit-agent)

This is a cleanup commit following the agent pattern unification work.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/deposit-agent.test.ts

@@ -11,7 +11,7 @@
  * 7. 거래 상태 검증
  */
 import { describe, it, expect, beforeEach, vi } from 'vitest';
-import { executeDepositFunction, DepositContext } from '../src/deposit-agent';
+import { executeDepositFunction, DepositContext } from '../src/agents/deposit-agent';
 import {
   createTestUser,
   createBankNotification,