feat: enhance UDPClient initialization with local port binding and add WebServerHandler for HTTP server management

main/network/wifi_handler.h

@@ -31,6 +31,9 @@ public:
     uint16_t& ap_count
   );
 
+  // Get current IP address (empty string if not connected)
+  std::string get_current_ip() const;
+
   static void wifi_event_handler(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data);
 
 private: