Model preview: AVA2 render-target window on a Vulkan colour target

Port of AVA2's CRenderTarget / GrpRenderTargetTexture / renderTarget module.
The host gains an RGBA8 offscreen colour pass for D3D colour render targets;
mt_preview shows wearable items on every allowed race and monsters with
motions, reached by X+click in the inventory and shop and from the wiki.
Player races are created as TYPE_PC so their parts exist.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/platform/ScriptLib/WikiScript.inc

@@ -184,6 +184,9 @@ class WikiWindow(ui.Window):
                     if row:self.Select('mobs',row)
                     else:self.QueryRemote('mob',vnum[1],0)
                 elif vnum[0]=='items':self.Open(vnum[1])
+                elif vnum[0]=='preview':
+                    import mt_preview
+                    mt_preview.Preview(vnum[1],vnum[2])
                 return
             row=self.catalogue.FindItem(vnum)
             if row:self.Select('items',row)
@@ -232,12 +235,15 @@ class WikiWindow(ui.Window):
                 else:
                     cost=self.catalogue.FindItem(offer['cost'])
                     lines.append((u'研究兑换：'+(cost['name'] if cost else u'#%d'%offer['cost'])+u' ×%d'%offer['amount'],offer['cost'] if cost else 0))
+            if row['kind'] in ('ITEM_WEAPON','ITEM_ARMOR','ITEM_COSTUME'):
+                import mt_preview
+                if mt_preview.Previewable('item',vnum):lines.append((u'模型预览',('preview','item',vnum)))
             lines.append((u'查看获取来源',('query','sources',vnum)))
             if row['kind'] in ('ITEM_GIFTBOX','ITEM_TREASURE_BOX'):lines.append((u'宝箱奖励预览',('query','chest',vnum)))
         else:
             lines=[(u'类型：'+U('矿石' if row['kind']=='STONE' else '怪物')+u' / '+U(RANK_NAMES.get(row['rank'],'普通')),0),(u'等级：%d  生命：%d'%(row['level'],row['hp']),0),
                    (u'基础攻击：%d—%d'%(row['attack_min'],row['attack_max']),0),
-                   (u'基础防御：%d  经验：%d'%(row['defense'],row['exp']),0),(u'查看服务端掉落列表',('query','mob',vnum))]
+                   (u'基础防御：%d  经验：%d'%(row['defense'],row['exp']),0),(u'模型预览',('preview','mob',vnum)),(u'查看服务端掉落列表',('query','mob',vnum))]
         if self.remote:lines=self.RemoteLines()
         self.links=lines
         pages=max(1,(len(lines)+self.rowCount-1)//self.rowCount)