fix(e2e) : restore Cypress setup and add smoke test

[ghost]

This PR restores and standardizes the Cypress end-to-end testing setup for the frontend and adds a basic smoke test to ensure the test infrastructure is working correctly.
Changes included
Re-enabled Cypress configuration and support files
Added Cypress E2E test structure under application/frontend/src/test/cypress
Included example Cypress tests for reference and future extension
Added a simple smoke test (e2e-smoke.cy.ts) to verify Cypress runs successfully

[northdpole]

please remove the example cypress tests, they don't make any sense in this context as they are for another application and the docs can be referenced normally

[ghost]

Thanks for the review !
I 've removed the example Cypress tests and kept only the relevant smoke test .. Please let me know if anything else needs adjustments.

[northdpole]

Consolidating with #774 under #967 — will close this PR once a single Cypress migration lands. See #967 for plan.