Implement project analytics functionality

[LaGodxy]

Description

This PR introduces a project-specific analytics endpoint that provides creators and admins with detailed insights into project performance and funding activity.

Key Features:

• Added GET /projects/:id/analytics endpoint for project-level insights

• Enforced access control (only project creator or admin can access)

• Calculated comprehensive analytics including:

  • Total donations
  • Unique donors
  • Donation trends (daily/weekly breakdown)
  • Top donors (with optional anonymization)
  • Funding velocity (rate of donations over time)

• Added support for date range filters to refine analytics queries

• Ensured data accuracy by sourcing metrics from blockchain records

This improves transparency for creators and provides actionable insights into project performance.

---

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)
• Test addition/improvement

---

Checklist

• I have run npm run build successfully with no errors
• I have run npm test and all tests pass
• If I added new test files, they all pass
• My code follows the project's style guidelines
• I have performed a self-review of my code

---

CI/CD Requirements

The following checks will run automatically on this PR:

1. ✅ Build Check - Ensures the project builds successfully
2. ✅ Test Check - Ensures all tests pass (including any new test files)

---

Screenshots (if applicable)

N/A

---

closes #75

[drips-wave]

@LaGodxy Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits