feat: upgrade to Go 1.25.3 and update build to include api-gateway

- Create ADR-0034 documenting Go version upgrade to 1.25.3
- Mark ADR-0002 as superseded by ADR-0034
- Update CI workflow to use Go 1.25.3
- Update Makefile to build both platform and api-gateway binaries
- Update CI workflow to build and upload both binaries
- Update documentation (ADR README and mkdocs.yml) to include ADR-0034

go.mod

@@ -6,6 +6,7 @@ require (
 	entgo.io/ent v0.14.5
 	github.com/gin-gonic/gin v1.10.1
 	github.com/google/uuid v1.6.0
+	github.com/hashicorp/consul/api v1.33.0
 	github.com/lib/pq v1.10.9
 	github.com/prometheus/client_golang v1.23.2
 	github.com/spf13/viper v1.18.0
@@ -17,6 +18,7 @@ require (
 	go.opentelemetry.io/otel/trace v1.38.0
 	go.uber.org/fx v1.24.0
 	go.uber.org/zap v1.26.0
+	google.golang.org/grpc v1.75.0
 )
 
 require (
@@ -45,7 +47,6 @@ require (
 	github.com/goccy/go-json v0.10.5 // indirect
 	github.com/google/go-cmp v0.7.0 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.2 // indirect
-	github.com/hashicorp/consul/api v1.33.0 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/hashicorp/go-hclog v1.5.0 // indirect
@@ -99,7 +100,6 @@ require (
 	golang.org/x/text v0.28.0 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20250825161204-c5933d9347a5 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20250825161204-c5933d9347a5 // indirect
-	google.golang.org/grpc v1.75.0 // indirect
 	google.golang.org/protobuf v1.36.8 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect