Add User Reputation System

[Mkalbani]

Description

Calculate user reputation based on contributions.

Reputation Formula

• Submit problem: +5 points
• Submit solution: +10 points
• Solution ranked Add Health Check Endpoint #1: +50 points
• Solution ranked Add Request Logging Middleware #2-3: +25 points
• Receive upvote: +2 points
• Receive downvote: -1 point

Acceptance Criteria

• Add reputation field to User entity
• Recalculate reputation after each contribution
• GET /users/:id/reputation endpoint
• Show reputation in user profile
• Add reputation badges (Bronze: 100+, Silver: 500+, Gold: 1000+)

Files to Change

• src/users/entities/user.entity.ts
• src/users/users.service.ts
• Create src/users/reputation.service.ts

Edge Cases

• Prevent gaming (can't delete/recreate to farm points)
• Cap points per day (max +100/day)

ETA: 12 hours

[Lynndabel]

Hi maintainer, please can you assign this issue to me? ETA: 6hours

[grantfox-oss]

🦊 GrantFox — @Lynndabel has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #8)
2. Your PR will be reviewed by the ThinknetCollective maintainers

Good luck! Track your progress on GrantFox.