Add rate limiting to MMR API endpoints

[raimannma]

Description

Implements rate limiting across all MMR-related API endpoints to protect against abuse and ensure fair resource usage. This change adds rate limit checks to 6 endpoints in the MMR module using a configurable quota system with IP-based, key-based, and global limits.

The rate limits are applied consistently across all endpoints:

• IP limit: 10 requests per 10 seconds
• Key limit: 10 requests per 10 seconds
• Global limit: 20 requests per 10 seconds

Additionally, the API documentation has been updated to reflect the new rate limit values (previously listed as 100req/s with no key/global limits).

Related Issue

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Performance improvement
• Code refactoring (no functional changes)
• Other (please describe):

How Has This Been Tested?

• Unit tests
• Integration tests
• Manual testing

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Additional Notes

The rate limiting is applied at the handler level for the following endpoints:

• GET /v1/players/mmr (batch MMR)
• GET /v1/players/mmr/hero (batch hero MMR)
• GET /v1/players/mmr/distribution (MMR distribution)
• GET /v1/players/mmr/distribution/hero/{hero_id} (hero MMR distribution)
• GET /v1/players/mmr/{account_id} (MMR history)
• GET /v1/players/mmr/{account_id}/hero/{hero_id} (hero MMR history)

https://claude.ai/code/session_01QYY6jEz4bRkMr9s7xsM1p7