fix(billing): use SELECT INTO for fee rate in trigger (MariaDB-safe)

feat(billing): configurable Snippe fee rate (default 2.5%) from July 1

Remove platform commission from WiFi sales

Migrate production app to v2 Omada workflow

Record successful token deauth events

Avoid schema change for token deauth retry

Retry deauth for expired token MACs

Add per-device portal payment options

plan leak fix, manual sales, payment status support, manual sms template and docs

Add portal payment display mode controls

Add tenant direct payment token sales

Add SSID/WLAN management: create WiFi network during device adoption

Add manual cash payment activation endpoint for admin

Initial commit — multi-tenant WiFi hotspot monetization platform