feat: NPC reactions gated by conditions, applying effects

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Semesterprojekt/src/main/java/thb/jeanluc/adventure/loader/ReferenceResolver.java

@@ -155,6 +155,8 @@ public class ReferenceResolver {
                         .consumes(consumes)
                         .gives(gives)
                         .response(r.response())
+                        .requires(ConditionDto.toModelList(r.requires()))
+                        .effects(EffectDto.toModelList(r.effects()))
                         .build();
                 npc.putReaction(r.onReceive(), reaction);
             }

Semesterprojekt/src/main/java/thb/jeanluc/adventure/loader/dto/ReactionDto.java

@@ -1,5 +1,7 @@
 package thb.jeanluc.adventure.loader.dto;
 
+import java.util.List;
+
 /**
  * YAML representation of a single NPC reaction.
  *
@@ -7,11 +9,19 @@ package thb.jeanluc.adventure.loader.dto;
  * @param response  text the NPC says after the exchange
  * @param gives     id of the item handed back; nullable
  * @param consumes  id of the item taken from the player; nullable
+ * @param requires  conditions that must hold; nullable
+ * @param effects   effects applied after a successful exchange; nullable
  */
 public record ReactionDto(
         String onReceive,
         String response,
         String gives,
-        String consumes
+        String consumes,
+        List<ConditionDto> requires,
+        List<EffectDto> effects
 ) {
+    /** Backward-compatible constructor without requires/effects. */
+    public ReactionDto(String onReceive, String response, String gives, String consumes) {
+        this(onReceive, response, gives, consumes, null, null);
+    }
 }