test: add API security tests using Bright

[derevnjuk]

Description

This PR adds security tests using Bright's SecTester SDK to ensure the robustness of our API endpoints. The tests cover various security vulnerabilities including SQL injection, XSS, and authentication bypass.

Test Plan

• Ensure the Bright API key is set in the environment variables.
• Run the security tests using the provided test scripts.
• Validate that the tests pass without any vulnerabilities detected.

Endpoints Tested

• GET /articles
• GET /articles/feed
• GET /articles/{slug}
• POST /articles
• PUT /articles/{slug}
• DELETE /articles/{slug}
• POST /articles/{slug}/favorite
• DELETE /articles/{slug}/favorite
• GET /articles/example-article/comments
• POST /articles/example-article/comments
• DELETE /articles/example-article/comments/1
• GET /profiles/johndoe
• POST /profiles/johndoe/follow
• DELETE /profiles/johndoe/follow
• POST /sentiment/score
• GET http://example.com/tags
• POST http://localhost:3000/api/users/login
• POST http://localhost:3000/api/users
• GET http://localhost:3000/api/user
• PUT http://localhost:3000/api/user

Checklist

• Tests implemented
• Documentation updated