Remove platform tenancy from SXCHNGE customer BFF (#34)

backend/go.mod

@@ -3,7 +3,6 @@ module git.sendico.io/tech/sxchnge/bff
 go 1.27.0
 
 require (
-	github.com/casbin/casbin/v3 v3.11.0
 	github.com/go-chi/chi/v5 v5.3.2
 	github.com/go-chi/cors v1.2.2
 	github.com/go-chi/jwtauth/v5 v5.4.0
@@ -18,7 +17,6 @@ require (
 	go.mongodb.org/mongo-driver/v2 v2.9.0
 	go.uber.org/zap v1.28.0
 	golang.org/x/crypto v0.56.0
-	golang.org/x/net v0.58.0
 	gopkg.in/yaml.v3 v3.0.1
 	moul.io/chizap v1.0.3
 )
@@ -28,8 +26,6 @@ require (
 	github.com/Azure/go-ansiterm v0.0.0-20250102033503-faa5f7b0171c // indirect
 	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/bmatcuk/doublestar/v4 v4.6.1 // indirect
-	github.com/casbin/govaluate v1.3.0 // indirect
 	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/containerd/errdefs v1.0.0 // indirect
@@ -76,7 +72,6 @@ require (
 	github.com/segmentio/asm v1.2.0 // indirect
 	github.com/shirou/gopsutil/v4 v4.26.6 // indirect
 	github.com/sirupsen/logrus v1.9.4 // indirect
-	github.com/stretchr/objx v0.5.3 // indirect
 	github.com/tklauser/go-sysconf v0.4.0 // indirect
 	github.com/tklauser/numcpus v0.12.0 // indirect
 	github.com/xdg-go/pbkdf2 v1.0.0 // indirect