Extracted 4 endpoint groups into separate sub-router modules:
- health.py: 1 endpoint (GET /health)
- upscale.py: 1 endpoint (POST /upscale)
- control.py: 2 endpoints (POST /control/process, GET /control/operations)
- social.py: 2 endpoints (POST /social/optimize, GET /social/platforms/{platform}/formats)
__init__.py now composes these sub-routers into the legacy router.
All 33 routes preserved. No functional changes.
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