build: support paragon as an npm workspace package

[arbrandes]

Description

Allows this app to be developed inside a site repo with Paragon and frontend-base bind-mounted under packages/.

The paragon peer range now also accepts a 0.0.0-dev checkout, and both are declared as devDependencies so Turborepo orders them before this app. Turborepo builds its task graph from dependencies and devDependencies only, so a peer-only declaration leaves no edge.

Part of openedx/paragon#4440.

LLM usage notice

Built with assistance from Claude.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.19%. Comparing base (06bbc72) to head (07783cb).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #29   +/-   ##
=======================================
  Coverage   74.19%   74.19%           
=======================================
  Files           6        6           
  Lines          62       62           
  Branches       10       10           
=======================================
  Hits           46       46           
  Misses         16       16           

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