feat: add Helmet security headers - #250
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Description
Closes #210
Add Helmet security headers to the NestJS API, including a Swagger-compatible Content Security Policy.
Implementation
helmetas a backend dependency.Compatibility
API routes remain unchanged. Swagger remains able to load its inline assets under the configured CSP.
Testing
npm test -- --runInBand security-headers.spec.ts— 1 passed.npm run build— passed.git diff --check— passed.Limitations
Repository-wide lint/format checks inherit existing CRLF/Prettier baseline errors across unrelated files.