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;
     }
 }