feat: implement user profile completeness scoring

[walexjnr]

Summary

Implements a profile completeness scoring system that gamifies profile completion to encourage users to fill out their profile information.

Changes

• src/profile-completeness/profile-completeness.service.ts - Scoring algorithm: evaluates 8 weighted profile fields (firstName, lastName, username, profilePicture, isEmailVerified, role, lastLoginAt, tenantId), returns score, percentage, completed/missing fields, level badge, and next incentive message
• src/profile-completeness/profile-completeness.controller.ts - GET /users/:userId/profile-completeness endpoint (JWT-protected)
• src/profile-completeness/profile-completeness.module.ts - Module wiring

Scoring Algorithm

Field	Points
First name	10
Last name	10
Username	10
Profile picture	20
Email verified	20
Role set	10
Logged in at least once	10
Organisation linked	10
Total	100

Levels & Incentives

• starter (0-39%) ? "Reach 40% to unlock Intermediate badge"
• intermediate (40-79%) ? "Reach 80% to unlock Complete Profile badge"
• complete (80-100%) ? no further incentive

Acceptance Criteria

• Scoring algorithm defined (weighted field scoring, 100-point max)
• Progress tracking visible (GET /users/:userId/profile-completeness)
• Incentives for completion (level badges + next incentive message)

closes #551

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