feat: injects public environment variables in runtime

[Iran-110]

🔗 Linked issue

resolves #1118 and #1427

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

It helps to handle runtime configs to override the options in practice.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 64.23%. Comparing base (e359c7f) to head (e975885).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/runtime/ipx.ts	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1738      +/-   ##
==========================================
- Coverage   64.28%   64.23%   -0.06%     
==========================================
  Files          79       79              
  Lines        3699     3702       +3     
  Branches      426      426              
==========================================
  Hits         2378     2378              
- Misses       1296     1299       +3     
  Partials       25       25              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[danielroe]

is there a reason why you need to use public? shouldn't NUXT_IPX_ALIAS work just as well, given that the endpoint is only called on the server side?