docs(app-backend): add backend system architecture overview#404

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LoopyB wants to merge 6 commits into

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louisabest/feature/system-architecture-doc

Commits on Apr 15, 2026

Add system architecture documentation draft
Louisa Best
committed
chore: remove system-architecture.md from tracking (local draft)
Louisa Best
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Commits on Apr 20, 2026

docs: add system architecture document for review
Louisa Best
committed

Commits on May 16, 2026

Merge remote-tracking branch 'origin/main' into louisabest/feature/system-architecture-doc
Louisa Best
committed

Commits on May 17, 2026

docs(backend): update system architecture evidence
Louisa Best
committed
docs(backend): update system architecture evidence 2
Louisa Best
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