feat: add SD-backed stats archive and dedicated /stats web console

src/helpers/NetworkStateProvider.h

@@ -0,0 +1,8 @@
+#pragma once
+
+class NetworkStateProvider {
+public:
+  virtual ~NetworkStateProvider() = default;
+  virtual bool isWifiConnected() const = 0;
+  virtual bool hasTimeSync() const = 0;
+};