Add CI/CD configuration with GitHub Actions

[dotunv]

Description

Despite CONTRIBUTING.md mentioning CI checks, there is no .github/workflows/ directory. The project needs automated CI for:

• Linting (ESLint for both apps)
• Type checking (TypeScript)
• Building (Turborepo build)
• Testing (once tests exist)
• Docker image builds

Proposed Workflows

CI Pipeline (on push/PR to main)

1. Install dependencies
2. Run linting
3. Run type checking
4. Run build
5. Run tests (if any exist)

Docker Build (on push to main)

1. Build API Docker image
2. Push to container registry (if configured)

Acceptance Criteria

• .github/workflows/ci.yml is created
• CI runs on push and PR to main
• Lint, type check, and build pass
• Tests run when available

Labels

enhancement backend frontend

[Okorie2000-code]

Hi Maintainer, I'd love to work on this issue. I understand the requirements and will submit a clean, well-tested PR within 24hrs. Please assign it to me