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 93.64%. Comparing base (4ba6cc4) to head (87b38c7).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1690   +/-   ##
=======================================
  Coverage   93.64%   93.64%           
=======================================
  Files          94       94           
  Lines        2076     2076           
  Branches      592      603   +11     
=======================================
  Hits         1944     1944           
  Misses        129      129           
  Partials        3        3           

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