Implement project lifecycle management

[LaGodxy]

Description

This PR introduces a comprehensive project lifecycle management system, enabling controlled transitions between active, paused, and completed states.

Key Features:

• Added endpoints:

  • PATCH /projects/:id/pause
  • PATCH /projects/:id/resume
  • POST /projects/:id/complete

• Enforced valid status transitions:

  • active → paused → active
  • active → completed
  • paused → completed

• Implemented role-based authorization (creator/admin only)

• Added automatic project completion when deadlines pass

• Prevented donations to paused or completed projects

• Implemented status history tracking for auditability

This improves consistency, security, and traceability across project operations.

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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

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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

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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)

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Screenshots (if applicable)

N/A

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closes #72

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