feat: add explicit RequestContext dependency pattern

[aabrius]

Summary

• Implements RequestContext class for explicit dependency injection
• Adds @ctx and @ReqContext decorators for controller parameter injection
• Provides fromCls() and tryFromCls() for CLS integration
• Includes helper methods (isSuperAdmin, userId, userEmail, with, toJSON)
• Adds 34 unit tests for context and decorators

Test plan

• Run npm test -- --testPathPattern="request-context" to verify all tests pass
• Use @ctx decorator in controllers

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 793cb77 and 980acee.

📒 Files selected for processing (8)

• apps/backend/package.json (1 hunks)
• apps/backend/src/common/context/index.ts (1 hunks)
• apps/backend/src/common/context/request-context.spec.ts (1 hunks)
• apps/backend/src/common/context/request-context.ts (1 hunks)
• apps/backend/src/common/decorators/index.ts (1 hunks)
• apps/backend/src/common/decorators/request-context.decorator.spec.ts (1 hunks)
• apps/backend/src/common/decorators/request-context.decorator.ts (1 hunks)
• apps/backend/src/common/index.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/explicit-dependencies

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