CI-001 — Basic CI Pipeline (GitHub Actions)

[M4S1N]

Description: Create a workflow that:

• Compiles the API (.NET) and runs dotnet test.
• Builds the scraper and frontend image (or runs ng build).
• (Optional) Runs ci/e2e.sh script for smoke tests with docker-compose (requires Docker runners).

Subtasks:

• .github/workflows/ci.yml.
• Steps: checkout, setup dotnet, build, test, build docker images (optional).

Acceptance Criteria:

• PR must launch CI and pass unit tests.
• (Optional) Pass E2E smoke tests in the pipeline.

Dependencies: Tests implemented.