#30 · RSVP confirmation email links to scoreboard for the +20 pts reveal

Context

RSVPing earns 20 pts but the user has to discover this on their own. Confirmation email should celebrate the points and link to /profile.

Acceptance criteria

• [ ] Confirmation email body adds: "You earned 20 points! View your scoreboard: <link>"
• [ ] Link includes UTM param ?utm_source=event_rsvp for tracking

Technical hints

• Email template lives in apps/event-service/src/email/ — look for the existing RSVP template

--- *Submit a merge request that says Closes #<this issue iid> in the description. On merge to main, the GitLab webhook will auto-award your bounty + the standard merge_pr (40 pts) to your scoreboard account. Email on commit must match your Authentik email.*