feat: standardize module icons with correct OpenSPP branding

- Fix 37 modules that had wrong/different icons or no icons
- All 96 modules now use the standardized OpenSPP icon (12567 bytes)
- Create missing static/description directories where needed
- Ensure consistent branding across all OpenSPP modules

Before: 59 correct, 7 wrong, 30 missing icons
After: 96 correct, 0 wrong, 0 missing icons

Fixed modules include:
- spp_basic_cash_entitlement_spent (was missing icon)
- spp_change_request_add_children_demo (had wrong icon)
- And 35 other modules with inconsistent branding

Author: jeremi