🌱 Remove EnableExtensionApi feature gate

[m1kola]

Description

We do not use this feature gate, but it appears in --help message.

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

[netlify]

✅ Deploy Preview for olmv1 ready!

Name	Link
🔨 Latest commit	f2f6063
🔍 Latest deploy log	https://app.netlify.com/sites/olmv1/deploys/670e5c46cb585100086753e6
😎 Deploy Preview	https://deploy-preview-1375--olmv1.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.84%. Comparing base (e5ecec7) to head (f2f6063).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1375   +/-   ##
=======================================
  Coverage   74.84%   74.84%           
=======================================
  Files          42       42           
  Lines        2516     2516           
=======================================
  Hits         1883     1883           
  Misses        449      449           
  Partials      184      184           

Flag	Coverage Δ
e2e	56.75% <ø> (ø)
unit	52.70% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

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