[Feature] Add API key management with authentication, rate limiting, and scope validation

[Gautam25Raj]

Summary

This PR introduces API key management with authentication, rate limiting, and scope-based access control, enabling secure programmatic access to the platform.

Feature

API Key Management

• Implemented API key generation and management
• Added support for authenticated API access using API keys

Security & Access Control

• Introduced scope-based validation for API keys
• Ensures endpoints are accessed only with proper permissions

Rate Limiting

• Integrated rate limiting for API key usage
• Prevents abuse and ensures fair usage across clients

Enhancement

• Strengthens overall backend security model
• Enables future integrations and third-party access

Notes

• No breaking changes expected
• Lays foundation for public API and external integrations

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🧪 Tests (adding or updating tests)

Checklist

• I have read the CONTRIBUTING.md document.
• 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.
• 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.
• Any dependent changes have been merged and published in downstream modules.