feat: add testing infrastructure utilities

[aabrius]

Summary

• Adds test factories for User and Account entities
• Implements auth helpers for JWT generation in tests
• Creates database helpers for test data management
• Provides mock utilities for CLS, Config, and repositories
• Adds 78 unit tests for all testing utilities

Test plan

• Run npm test -- --testPathPattern="user.factory|account.factory|auth.helper|database.helper" to verify all tests pass
• Use factories in integration tests

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 793cb77 and 87de3bc.

📒 Files selected for processing (14)

• apps/backend/package.json (1 hunks)
• apps/backend/src/test/factories/account.factory.spec.ts (1 hunks)
• apps/backend/src/test/factories/account.factory.ts (1 hunks)
• apps/backend/src/test/factories/index.ts (1 hunks)
• apps/backend/src/test/factories/user.factory.spec.ts (1 hunks)
• apps/backend/src/test/factories/user.factory.ts (1 hunks)
• apps/backend/src/test/helpers/auth.helper.spec.ts (1 hunks)
• apps/backend/src/test/helpers/auth.helper.ts (1 hunks)
• apps/backend/src/test/helpers/database.helper.spec.ts (1 hunks)
• apps/backend/src/test/helpers/database.helper.ts (1 hunks)
• apps/backend/src/test/helpers/index.ts (1 hunks)
• apps/backend/src/test/helpers/test-app.helper.ts (1 hunks)
• apps/backend/src/test/index.ts (1 hunks)
• apps/backend/test/users.e2e-spec.ts (1 hunks)

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/testing-infrastructure

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