feat(ui): make API keys instruction configurable via NEXT_PUBLIC_API_…

[rahulkumaar03]

Description and Related Issue(s)

The intro line on the API keys account page (“Create API keys to use for your RPC and EthRPC API requests…”) was hardcoded. This change makes it optional and environment-driven, consistent with the existing NEXT_PUBLIC_API_KEYS_ALERT_MESSAGE banner on the same page.

Proposed Changes

Make the API keys account page intro line (“Create API keys to use for your RPC and EthRPC API requests…”) configurable via environment variables, instead of hardcoded React copy.

Checklist for PR author

• I have tested these changes locally.
• I added tests to cover any new functionality, following this guide
• Whenever I fix a bug, I include a regression test to ensure that the bug does not reappear silently.
• If I have added a feature or functionality that is not privacy-compliant (e.g., tracking, analytics, third-party services), I have disabled it for private mode.
• If I have added, changed, renamed, or removed an environment variable
  • I updated the list of environment variables in the documentation
  • I made the necessary changes to the validator script according to the guide
  • I added "ENVs" label to this pull request

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Note

Medium Risk
Introduces dangerouslySetInnerHTML rendering of env-provided HTML on the API keys page; misconfiguration could enable XSS or broken markup. Otherwise changes are localized to UI config/env validation and documentation.

Overview
Makes the API keys page intro text optional and environment-configurable via new NEXT_PUBLIC_API_KEYS_INSTRUCTION, replacing the previously hardcoded copy.

Plumbs the new env var through configs/app/ui.ts, adds it to the env validator schema and test .env.base, and documents it in docs/ENVS.md. The API keys page now renders the instruction HTML (when set) above the list and styles any included links.

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[tom2drum]

Hi @rahulkumaar03,
Thank you for your contribution. However, we would prefer to keep the current text as the default if the variable is not set.