Feature: Add API response compression with gzip

[Smartdevs17]

Problem

API responses are not compressed. JSON responses for position queries or transaction lists can be large.

Context

Compression reduces bandwidth usage and improves response times for API consumers.

Proposed Solution

Add compression middleware:

import compression from 'compression';
app.use(compression());

Acceptance Criteria

• compression package added
• Responses compressed when client supports it
• Accept-Encoding: gzip honored
• Tests verify compression header

Technical Notes

• File: api/src/app.ts

Constraints

• Must not compress already-small responses (overhead > benefit)

[drips-wave]

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