Helment

[Qoder-Undefined]

main.ts: no security headers (Helmet) — API responses lack XSS protection, CSP, and other HTTP security headers

Summary
The NestJS application does not use helmet middleware. Financial APIs must send security headers to prevent clickjacking, XSS, MIME sniffing, and other client-side attacks.

What Needs to Be Done
Install helmet package: npm install helmet
Add import helmet from 'helmet' and app.use(helmet()) in main.ts before route registration
Configure contentSecurityPolicy options appropriate for an API (not a browser app)
Key Files
src/main.ts
package.json
Acceptance Criteria
helmet is installed and applied as middleware
HTTP responses include X-Frame-Options, X-Content-Type-Options, Strict-Transport-Security and other Helmet defaults
No regressions in existing API responses
closes #556

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[portableDD]

@Qoder-Undefined please resolve conflicts