Lukas 9a43123b3a docs: Define explicit DI container strategy for backend service graph ...

- Add comprehensive 'Dependency Wiring and Service Composition' section to
  Architekture.md (§ 2.3) documenting:
  * The lightweight FastAPI Depends() pattern used as composition root
  * Service composition through explicit parameter passing
  * Service context dependencies pattern (SessionServiceContext, etc.)
  * Repository boundary enforcement
  * Lifecycle and scope management
  * Checklist for adding new services

- Update Backend-Development.md to reference the new Architecture section
  from the 'Dependency Layering' section

- Enhance dependencies.py module docstring with clear explanation of:
  * Composition root pattern
  * Explicit over implicit principles
  * Service context dependencies
  * Repository boundary enforcement

This resolves issue #39 by providing clear guidance on dependency wiring
without over-engineering. The pattern uses FastAPI's built-in Depends()
framework and avoids heavyweight container libraries, keeping the solution
lightweight and maintainable.

Fixes: #39

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

2026-04-29 20:25:25 +02:00

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