Add comprehensive Javadoc documentation to server components, including annotations, request/response handling, routing, and WebSocket support.

src/main/java/dev/coph/nextusweb/server/json/JsonMapper.java

@@ -3,10 +3,28 @@ package dev.coph.nextusweb.server.json;
 import tools.jackson.databind.ObjectMapper;
 
 
+/**
+ * Holder for the application-wide Jackson {@link ObjectMapper}.
+ *
+ * <p>A single, pre-configured mapper instance is shared across the whole server because
+ * {@code ObjectMapper} is thread-safe once configured and is relatively expensive to build.
+ * Centralizing it here ensures every component (request parsing, response serialization,
+ * WebSocket payloads) uses identical serialization settings.</p>
+ *
+ * <p>This class is a static holder and cannot be instantiated.</p>
+ */
 public final class JsonMapper {
+
+    /**
+     * The shared, thread-safe Jackson mapper used throughout the server for all JSON reading
+     * and writing.
+     */
     public static final ObjectMapper MAPPER = tools.jackson.databind.json.JsonMapper.builder()
             // .addModule(new JavaTimeModule())
             .build();
-    
+
+    /**
+     * Private constructor preventing instantiation of this static holder class.
+     */
     private JsonMapper() {}
-}
+}