Backend L3 split into 3a (Security & Auth), 3b (Document/File/Import), 3c (People/Users/Groups). Frontend L3 split into 3a (Middleware/Auth/Layout) and 3b (Pages & Shared Components). Each sub-diagram stays within dagre's clean-layout range (5–10 components, 6–12 relationships). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>