client:build.base: env.CLIENT__BASE_HREF

[Vizhy]

Summary

Type of Change

• New feature (non-breaking change that adds functionality)
• Build/CI improvements

Changes Made

Added a client build configuration input via environment variable: CLIENT__BASE_HREF
This enables deploying the Inspector client application under different base routes
Default behavior remains intact when the variable is not set

Testing

Testing

• Manual testing performed
  build and run | localhost APACHE

Test Results and/or Instructions

npm run build > without using CLIENT__BASE_HREF | to check the non-breaking ness of the change
SET CLIENT__BASE_HREF=/check && npm run build

Checklist

no code changes
only client build configuration extended

Breaking Changes

None

Additional Context

This change makes it easier to deploy the Inspector client behind reverse proxies or under sub-paths without additional build-time customization.