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.

examples/neopattern/NeoPatternService.cpp

@@ -1,5 +1,5 @@
 #include "NeoPatternService.h"
-#include "ApiServer.h"
+#include "spore/core/ApiServer.h"
 
 NeoPatternService::NeoPatternService(TaskManager& taskMgr, uint16_t numPixels, uint8_t pin, uint8_t type)
     : taskManager(taskMgr),

examples/neopattern/NeoPatternService.h

@@ -1,6 +1,6 @@
 #pragma once
-#include "services/Service.h"
-#include "TaskManager.h"
+#include "spore/Service.h"
+#include "spore/core/TaskManager.h"
 #include "NeoPattern.cpp"
 #include <map>
 #include <vector>

examples/neopattern/main.cpp

@@ -1,5 +1,5 @@
 #include <Arduino.h>
-#include "Spore.h"
+#include "spore/Spore.h"
 #include "NeoPatternService.h"
 
 #ifndef LED_STRIP_PIN