fix(api): correct NexusArmorSet parser for actual API structure

- Fixed field name: API uses 'Armors' not 'Pieces'
- Fixed protection location: API uses 'Defense' not per-piece protection
- Armors is array of arrays, now properly flattened
- Added set bonus parsing from EffectsOnSetEquip

core/nexus_full_api.py

@@ -265,28 +265,44 @@ class NexusArmorSet(NexusItem):
     def from_api(cls, data: Dict[str, Any]) -> "NexusArmorSet":
         """Create from API response."""
         props = data.get('Properties', {})
-        pieces = data.get('Pieces', []) or []
         
-        # Calculate total protection from pieces
-        protection = ProtectionProfile()
-        for piece_data in pieces:
-            prot = piece_data.get('Protection', {})
-            protection.impact += safe_decimal(prot.get('Impact'))
-            protection.cut += safe_decimal(prot.get('Cut'))
-            protection.stab += safe_decimal(prot.get('Stab'))
-            protection.burn += safe_decimal(prot.get('Burn'))
-            protection.cold += safe_decimal(prot.get('Cold'))
-            protection.acid += safe_decimal(prot.get('Acid'))
-            protection.electric += safe_decimal(prot.get('Electric'))
+        # Get pieces from 'Armors' field (array of arrays)
+        armors_data = data.get('Armors', []) or []
+        pieces = []
+        for armor_group in armors_data:
+            if isinstance(armor_group, list):
+                for armor in armor_group:
+                    pieces.append(armor.get('Name', ''))
+            elif isinstance(armor_group, dict):
+                pieces.append(armor_group.get('Name', ''))
+        
+        # Get total protection from 'Defense' field
+        defense = props.get('Defense', {})
+        protection = ProtectionProfile(
+            impact=safe_decimal(defense.get('Impact')),
+            cut=safe_decimal(defense.get('Cut')),
+            stab=safe_decimal(defense.get('Stab')),
+            burn=safe_decimal(defense.get('Burn')),
+            cold=safe_decimal(defense.get('Cold')),
+            acid=safe_decimal(defense.get('Acid')),
+            electric=safe_decimal(defense.get('Electric')),
+        )
+        
+        # Get set bonus from EffectsOnSetEquip
+        set_bonus = None
+        effects = data.get('EffectsOnSetEquip', [])
+        if effects:
+            # Join all effects into a string
+            set_bonus = "; ".join([str(e) for e in effects])
 
         return cls(
             id=data.get('Id', 0),
             name=data.get('Name', 'Unknown'),
             item_id=str(data.get('Id', 0)),
             category='armorset',
-            pieces=[p.get('Name', '') for p in pieces],
+            pieces=pieces,
             total_protection=protection,
-            set_bonus=props.get('SetBonus'),
+            set_bonus=set_bonus,
         )