Tap the card on the charger and the number fills itself in

The enrolment the Anker app does, done here: 0108 a2=7 opens the reader,
0908 brings back the UID. The frames this sends are byte-for-byte the
ones the app was captured sending — checksum included — which is what the
new test asserts.

Adding and removing now write the charger as well as the account: the
device write is the app's own message, the account write is the inferred
one that carries the name, and either may fail without the other.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

API Server/internal/api/server.go

@@ -53,6 +53,7 @@
 //	GET    /api/integrations/anker-solix/chargers
 //	GET    /api/integrations/anker-solix/chargers/{sn}/details
 //	POST   /api/integrations/anker-solix/chargers/{sn}/rfid-cards
+//	POST   /api/integrations/anker-solix/chargers/{sn}/rfid-cards/scan
 //	DELETE /api/integrations/anker-solix/chargers/{sn}/rfid-cards/{number}
 //	GET    /api/integrations/greencell      PUT    /api/integrations/greencell
 //	POST   /api/integrations/greencell/health
@@ -444,6 +445,7 @@ func (s *Server) Handler() http.Handler {
 	mux.HandleFunc("GET /api/integrations/anker-solix/chargers", s.handleAnkerChargers)
 	mux.HandleFunc("GET /api/integrations/anker-solix/chargers/{sn}/details", s.handleAnkerChargerDetails)
 	mux.HandleFunc("POST /api/integrations/anker-solix/chargers/{sn}/rfid-cards", s.handleAnkerCardSave)
+	mux.HandleFunc("POST /api/integrations/anker-solix/chargers/{sn}/rfid-cards/scan", s.handleAnkerCardScan)
 	mux.HandleFunc("DELETE /api/integrations/anker-solix/chargers/{sn}/rfid-cards/{number}", s.handleAnkerCardDelete)
 	mux.HandleFunc("GET /api/integrations/greencell", s.handleGetGreencell)
 	mux.HandleFunc("PUT /api/integrations/greencell", s.handlePutGreencell)