Implement four backend features: auth rate limiting, health checks, u…

[fadee26]

Summary

This PR implements four key backend features:

1. Auth Rate Limiting ([Backend] Rate Limiting on Authentication Endpoints #276): Adds strict IP-based rate limits to authentication endpoints to prevent abuse
2. Health Check Endpoints ([Backend] Health Check and Monitoring Endpoints #283): Provides monitoring and health check endpoints for container orchestration
3. User Profiles ([Backend] User Profile: Email, Display Name, and Notification Preferences #285): Adds support for user display names, emails, avatars, and email verification
4. Milestone Partial Releases ([Backend] Escrow Milestone Partial Release with Proportional Payouts #278): Enables releasing milestone escrow payments incrementally

Changes Made

• Rate limiting on auth endpoints with custom IP-based guard
• HealthModule with /health, /health/live, /health/ready, /health/info
• Updated User entity with profile fields and EmailVerification entity
• New profile management endpoints
• Escrow milestone partial release functionality
• New migration for all database changes

closes #276
closes #283
closes #285
closes #278

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