platform: modularize api/gui, add docs-tests-web foundation, and refresh root config

selective-vpn-api/app/transport_client_runtime_helpers.go

@@ -0,0 +1,21 @@
+package app
+
+func findTransportClientIndex(items []TransportClient, id string) int {
+	for i := range items {
+		if items[i].ID == id {
+			return i
+		}
+	}
+	return -1
+}
+
+func cloneMap(in map[string]any) map[string]any {
+	if in == nil {
+		return nil
+	}
+	out := make(map[string]any, len(in))
+	for k, v := range in {
+		out[k] = v
+	}
+	return out
+}