feat: integrate Sentry for error tracking

[Christopherdominic]

• Install @sentry/nestjs in backend and @sentry/nextjs in frontend
• Configure Sentry initialization with DSN from environment
• Add instrument.ts for backend error capture
• Configure Sentry client, server, and edge configs for frontend
• Capture unhandled exceptions and promise rejections
• Add release tracking tied to git commit SHA
• Filter sensitive data (cookies, auth headers) before sending
• Add SENTRY_DSN and GIT_COMMIT_SHA to .env.example files
• Update CI workflow to inject commit SHA during builds

Closes #107

Description

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 change)
• Documentation update
• Dependency update
• CI/CD improvement

Related Issues

Closes #

Testing

• Unit tests added/updated
• Integration tests added/updated
• E2E tests added/updated (if applicable)
• Manual testing performed

Documentation

• README updated (if applicable)
• API documentation updated (if applicable)
• Code comments added for complex logic
• Migration guide added (if breaking changes)

Breaking Changes

• No breaking changes
• Breaking changes documented below:

Checklist

• My code follows the project's style guidelines
• 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 passed locally with my changes
• Any dependent changes have been merged and published

Screenshots (if applicable)

Additional Context

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