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 91.81%. Comparing base (3376b89) to head (2153ff9).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #871   +/-   ##
=======================================
  Coverage   91.81%   91.81%           
=======================================
  Files         151      151           
  Lines        1283     1283           
  Branches      272      275    +3     
=======================================
  Hits         1178     1178           
  Misses        100      100           
  Partials        5        5           

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