refactor: migrate LDAP sync to an actor (#1651)

Co-authored-by: Kyle Mendell <kmendell@ofkm.us>

backend/internal/appconfig/resolver.go

@@ -0,0 +1,10 @@
+package appconfig
+
+import (
+	"context"
+)
+
+// AppConfigResolver loads the current application configuration, so handlers can pass it explicitly to the service methods that need it
+type AppConfigResolver interface {
+	GetConfig(ctx context.Context) (*AppConfigModel, error)
+}