Add badge awarding logic — currently badges can only be assigned via seed

[3m1n3nc3]

Description

The UserBadge join table, Badge model, and AchievementsDialog component exist and render correctly. However, there is no server-side logic to award badges based on user activity. The only way a user can have badges is if they are manually seeded. The context AWARD_BADGE action updates memory only.

More info

• Create a checkAndAwardBadges(userId: string) server-side function that evaluates eligibility rules and creates UserBadge records.
• This function should be called from API endpoints after relevant actions (post created, entry won, etc.).
• Example rules:
  • "First Giveaway" badge: awarded when a user creates their first giveaway.
  • "Generous Heart" badge: awarded after contributing to 10 help requests.
  • "Community Builder" badge: awarded when the user reaches 100 followers.
• The /api/auth/me endpoint (and /api/users/[id]) already return badges with awardedAt, so the UI will reflect new badges automatically once the awarding logic exists.
• Remove the in-memory checkAndAwardBadges call from app-context.tsx once the server-side version is in place.

[Nabeelahh]

@Nabeelahh has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi maintainer I have thoroughly read the description to this issue and I can resolve this according to the description required ensuring it meet all the acceptance criteria kindly assign.

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Congratulations, @Nabeelahh! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

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