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

selective-vpn-api/app/transport_backends_runtime_modes.go

@@ -0,0 +1,49 @@
+package app
+
+import "strings"
+
+type transportUnsupportedRuntimeBackend struct {
+	mode string
+}
+
+func (b transportUnsupportedRuntimeBackend) ID() string {
+	return "unsupported"
+}
+
+type transportMockBackend struct{}
+
+func (transportMockBackend) ID() string { return "mock" }
+
+func (transportMockBackend) Action(_ TransportClient, action string) transportBackendActionResult {
+	action = strings.ToLower(strings.TrimSpace(action))
+	return transportBackendActionResult{
+		OK:       true,
+		ExitCode: 0,
+		Message:  "mock backend " + action + " done",
+	}
+}
+
+func (transportMockBackend) Health(client TransportClient) transportBackendHealthResult {
+	status := normalizeTransportStatus(client.Status)
+	return transportBackendHealthResult{
+		OK:        true,
+		Status:    status,
+		LatencyMS: client.Health.LatencyMS,
+	}
+}
+
+func (transportMockBackend) Provision(client TransportClient) transportBackendActionResult {
+	return transportBackendActionResult{
+		OK:       true,
+		ExitCode: 0,
+		Message:  "mock backend provision skipped for " + client.ID,
+	}
+}
+
+func (transportMockBackend) Cleanup(client TransportClient) transportBackendActionResult {
+	return transportBackendActionResult{
+		OK:       true,
+		ExitCode: 0,
+		Message:  "no cleanup required for backend mock (" + client.ID + ")",
+	}
+}