Staging Smoke Test Script

[Huygon764]

Problem: No way to test full transaction flow on stagingwithout a browser. Existing E2E test only runs locally via supertest against an in-memory NestJS server.

Expectation:

• Create a smoke test script using HTTP client (axios) against a remote API. Config: TEST_API_URL, TEST_CHAIN_RPC, test wallet private key.
• Flow: login → create account → fund account (send ETH via RPC) → reserve nonce → compute txHash → create tx → approve (signer B) → execute → verify status via GET API (assert EXECUTED).
• Refactor from existing E2E test, replacing request(server) with axios calls and Prisma verification with API assertions.