feat: persistent custom labels

include/spore/core/NodeContext.h

@@ -20,6 +20,7 @@ public:
     NodeInfo self;
     std::map<String, NodeInfo>* memberList;
     ::Config config;
+    std::map<String, String> constructorLabels;  // Labels passed to constructor (not persisted)
 
     using EventCallback = std::function<void(void*)>;
     std::map<std::string, std::vector<EventCallback>> eventRegistry;
@@ -29,4 +30,5 @@ public:
     void on(const std::string& event, EventCallback cb);
     void fire(const std::string& event, void* data);
     void onAny(AnyEventCallback cb);
+    void rebuildLabels();  // Rebuild self.labels from constructorLabels + config.labels
 };

include/spore/services/NodeService.h

@@ -20,4 +20,5 @@ private:
     void handleUpdateUpload(AsyncWebServerRequest* request, const String& filename, size_t index, uint8_t* data, size_t len, bool final);
     void handleRestartRequest(AsyncWebServerRequest* request);
     void handleEndpointsRequest(AsyncWebServerRequest* request);
+    void handleConfigRequest(AsyncWebServerRequest* request);
 };

include/spore/types/Config.h

@@ -3,6 +3,7 @@
 #include <Arduino.h>
 #include <LittleFS.h>
 #include <ArduinoJson.h>
+#include <map>
 
 class Config {
 public:
@@ -62,6 +63,9 @@ public:
     uint32_t critical_memory_threshold_bytes;
     size_t max_concurrent_http_requests;
     
+    // Custom Labels
+    std::map<String, String> labels;
+    
     // Constructor
     Config();