Fix frontend Traefik routing to use root domain for prod

Robert Szellrequested to merge
dev into stage

Changed frontend Host rule from frontend.${PROJECT_BASE_URL} to ${PROJECT_BASE_URL} so production frontend is accessible at mentorprogram.prosperitati.rs

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 4.5 noreply@anthropic.com

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