[Frontend][Tech-debt] Legacy pages/ router coexists with the new app/ router — dual routing systems

[Penielka]

Overview

The frontend contains both the legacy Pages Router (frontend/src/pages/ — _app.tsx, _document.tsx, ~50 page files) and the newer App Router (frontend/src/app/). Maintaining two routing systems doubles routing/middleware/_app-level logic, splits auth and layout behavior across both, and creates ambiguity about where new pages belong.

Evidence

• frontend/src/pages/_app.tsx, frontend/src/pages/_document.tsx and page files
• frontend/src/app/ — app router pages (settings, profile, admin, dashboard, ...)

Acceptance Criteria

• Decide on a single router and document the migration plan
• Migrate remaining pages/ routes to app/ (or vice versa)
• Remove the obsolete _app.tsx/_document.tsx after migration

Files to Modify

• frontend/src/pages/
• frontend/src/app/
• frontend/next.config.js

Priority: Low

[Ardecrownn]

Hi maintainer, can I work on this issue please