feat(D-01): implement ResistanceComponent, improve stack-aware resistance lookup

src/main/java/com/tiedup/remake/v2/bondage/component/ResistanceComponent.java

@@ -2,11 +2,31 @@ package com.tiedup.remake.v2.bondage.component;
 
 import com.google.gson.JsonObject;
 
+/**
+ * Component: struggle resistance for data-driven items.
+ *
+ * JSON config: {@code "resistance": {"base": 150}}
+ */
 public class ResistanceComponent implements IItemComponent {
 
-    private ResistanceComponent() {}
+    private final int baseResistance;
+
+    private ResistanceComponent(int baseResistance) {
+        this.baseResistance = baseResistance;
+    }
 
     public static IItemComponent fromJson(JsonObject config) {
-        return new ResistanceComponent();
+        int base = 100;
+        if (config != null && config.has("base")) {
+            base = config.get("base").getAsInt();
+        }
+        return new ResistanceComponent(base);
+    }
+
+    /**
+     * Get the base resistance for this item.
+     */
+    public int getBaseResistance() {
+        return baseResistance;
     }
 }

src/main/java/com/tiedup/remake/v2/bondage/datadriven/DataDrivenBondageItem.java

@@ -7,6 +7,7 @@ import com.tiedup.remake.v2.bondage.capability.V2EquipmentHelper;
 import com.tiedup.remake.v2.bondage.component.ComponentHolder;
 import com.tiedup.remake.v2.bondage.component.ComponentType;
 import com.tiedup.remake.v2.bondage.component.IItemComponent;
+import com.tiedup.remake.v2.bondage.component.ResistanceComponent;
 import com.tiedup.remake.v2.bondage.items.AbstractV2BondageItem;
 import java.util.List;
 import java.util.Map;
@@ -150,6 +151,21 @@ public class DataDrivenBondageItem extends AbstractV2BondageItem {
                     .entrySet()) {
                     ItemStack stack = entry.getValue();
                     if (stack.getItem() == this) {
+                        // Try component first (stack-aware, fixes I-03)
+                        ResistanceComponent comp = DataDrivenBondageItem
+                            .getComponent(
+                                stack,
+                                ComponentType.RESISTANCE,
+                                ResistanceComponent.class
+                            );
+                        if (comp != null) {
+                            maxDifficulty = Math.max(
+                                maxDifficulty,
+                                comp.getBaseResistance()
+                            );
+                            continue;
+                        }
+                        // Fallback: read from definition directly
                         DataDrivenItemDefinition def =
                             DataDrivenItemRegistry.get(stack);
                         if (def != null) {