fix: hotspot, demo, i18n and type updates

public/scenes/demo.json

@@ -125,6 +125,7 @@
         {
           "id": "hs_desk",
           "label": "查看书桌",
+          "labelKey": "scene.investigation_site.hotspot.desk",
           "targetScene": "desk_detail",
           "x": 154, "y": 144, "width": 230, "height": 101,
           "effects": [
@@ -135,12 +136,14 @@
         {
           "id": "hs_window",
           "label": "查看窗户",
+          "labelKey": "scene.investigation_site.hotspot.window",
           "targetScene": "corridor",
           "x": 602, "y": 43, "width": 192, "height": 202
         },
         {
           "id": "hs_closet",
           "label": "检查衣柜",
+          "labelKey": "scene.investigation_site.hotspot.closet",
           "targetScene": "desk_detail",
           "x": 422, "y": 346, "width": 128, "height": 187,
           "conditions": [