refactor: switch config format from YAML to TOML

- Replace gopkg.in/yaml.v3 with github.com/BurntSushi/toml
- Update struct tags from yaml to toml
- Update config tests to use TOML syntax
- Add testdata/config.toml, update Helm configmap template

go.mod

@@ -3,9 +3,9 @@ module proto-gen
 go 1.26.5
 
 require (
+	github.com/BurntSushi/toml v1.6.0
 	github.com/go-chi/chi/v5 v5.3.1
 	github.com/google/uuid v1.6.0
-	gopkg.in/yaml.v3 v3.0.1
 	k8s.io/api v0.36.3
 	k8s.io/apimachinery v0.36.3
 	k8s.io/client-go v0.36.3
@@ -44,6 +44,7 @@ require (
 	google.golang.org/protobuf v1.36.12-0.20260120151049-f2248ac996af // indirect
 	gopkg.in/evanphx/json-patch.v4 v4.13.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/klog/v2 v2.140.0 // indirect
 	k8s.io/kube-openapi v0.0.0-20260317180543-43fb72c5454a // indirect
 	k8s.io/utils v0.0.0-20260210185600-b8788abfbbc2 // indirect