feat: WiFi manager with station/AP mode and mDNS

Co-authored-by: Cursor <cursoragent@cursor.com>

src/wifi_manager.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <Arduino.h>
+#include "settings.h"
+
+class WiFiManager {
+public:
+    void begin(SettingsManager& settings);
+    bool isConnected();
+    bool isAPMode();
+    String getIP();
+    int getRSSI();
+    void startAP();
+    void startStation();
+    void setupMDNS(const char* hostname);
+
+private:
+    SettingsManager* _settings = nullptr;
+    bool _apMode = false;
+    int _retryCount = 0;
+
+    bool attemptConnection(const String& ssid, const String& pass);
+};