feat: expose business KPI metrics for MRR and churn

Author: OluRemiFour

go.mod

@@ -133,7 +133,6 @@ require (
 	github.com/quic-go/qpack v0.6.0 // indirect
 	github.com/quic-go/quic-go v0.59.0 // indirect
 	github.com/rcrowley/go-metrics v0.0.0-20250401214520-65e299d6c5c9 // indirect
-	github.com/redis/go-redis/v9 v9.7.1 // indirect
 	github.com/segmentio/asm v1.2.1 // indirect
 	github.com/segmentio/kafka-go v0.4.47 // indirect
 	github.com/shirou/gopsutil/v4 v4.26.2 // indirect
@@ -168,6 +167,5 @@ require (
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20260526163538-3dc84a4a5aaa // indirect
 	google.golang.org/grpc v1.81.1 // indirect
 	google.golang.org/protobuf v1.36.11 // indirect
-	pgregory.net/rapid v1.1.0 // indirect
 	sigs.k8s.io/yaml v1.6.0 // indirect
 )

kpi_coverage

@@ -0,0 +1 @@
+mode: set