feat: Add NeoPattern example and update API server functionality

- Add new NeoPattern example with pattern-based LED control
- Update ApiServer with enhanced functionality
- Modify neopixel example
- Update platformio configuration

include/ApiServer.h

@@ -26,6 +26,7 @@ public:
         String location; // "query" | "body" | "path" | "header"
         String type;     // e.g. "string", "number", "boolean"
         std::vector<String> values; // optional allowed values
+        String defaultValue; // optional default value (stringified)
     };
     struct EndpointCapability {
         String uri;