refactor: reorganize project structure with modern C++ namespace organization

- Restructure include/ and src/ directories with logical grouping
- Move core components to spore/core/ (NodeContext, NetworkManager, TaskManager, ClusterManager, ApiServer)
- Move services to spore/services/ (NodeService, NetworkService, ClusterService, TaskService)
- Move types to spore/types/ (NodeInfo, ApiTypes, Config)
- Move internal components to spore/internal/ (Globals)
- Update all #include statements to use new namespace paths
- Update platformio.ini build filters for all environments
- Update all example files to use new include paths
- Maintain backward compatibility for public API
- Improve code organization, maintainability, and scalability

This reorganization follows modern C++ project structure patterns and provides
clear separation between public API, internal implementation, and utilities.
All examples compile successfully with the new structure.

include/spore/services/NetworkService.h

@@ -0,0 +1,22 @@
+#pragma once
+#include "spore/Service.h"
+#include "spore/core/NetworkManager.h"
+#include "spore/core/NodeContext.h"
+
+class NetworkService : public Service {
+public:
+    NetworkService(NetworkManager& networkManager);
+    void registerEndpoints(ApiServer& api) override;
+    const char* getName() const override { return "Network"; }
+
+private:
+    NetworkManager& networkManager;
+
+    // WiFi scanning endpoints
+    void handleWifiScanRequest(AsyncWebServerRequest* request);
+    void handleGetWifiNetworks(AsyncWebServerRequest* request);
+
+    // Network status endpoints
+    void handleNetworkStatus(AsyncWebServerRequest* request);
+    void handleSetWifiConfig(AsyncWebServerRequest* request);
+};