v3.10.6 - Performance Improvements

What changed

• Stopped bootstrapping admin reporting functionality on public site requests.
• Removed unused scaffolded frontend CSS and JavaScript enqueue hooks, avoiding unnecessary public-page asset requests.
• Changed the Partner Export country selector to use a lightweight distinct-country query.
• Applied a selected country inside the participant SQL query so admin display and CSV export no longer build every learner/module row before filtering.

Validation

• PHP syntax validation passed for changed PHP files under PHP 8.4.
• Committed diff whitespace check passed.