Extracted 2 endpoint groups into separate sub-router modules: - edit.py: 4 endpoints (POST /edit/process, GET /edit/operations, GET /edit/models, POST /edit/recommend) - face_swap.py: 3 endpoints (POST /face-swap/process, GET /face-swap/models, POST /face-swap/recommend) All 33 routes preserved (10 extracted in B1, 7 extracted in B2, 16 remaining in legacy).