feat: engine improvements, new scenes, videos, subtitles, hotspot component and docs update

public/scenes/demo.json

@@ -2,7 +2,8 @@
   "startScene": "intro",
   "variables": {
     "trust": 50,
-    "courage": 0
+    "courage": 0,
+    "investigation": 0
   },
   "scenes": {
     "intro": {
@@ -24,12 +25,86 @@
             { "type": "add", "target": "courage", "value": -5 }
           ]
         },
+        {
+          "text": "仔细搜索房间",
+          "targetScene": "investigation_site"
+        },
         {
           "text": "留在原地，什么也不做",
           "targetScene": "stay"
         }
       ]
     },
+    "investigation_site": {
+      "id": "investigation_site",
+      "type": "image",
+      "videoUrl": "",
+      "imageUrl": "/images/investigation_scene.jpg",
+      "subtitleUrl": "/subtitles/investigation.vtt",
+      "hotspots": [
+        {
+          "id": "hs_desk",
+          "label": "查看书桌",
+          "targetScene": "desk_detail",
+          "x": 0.12, "y": 0.20, "width": 0.18, "height": 0.14,
+          "effects": [
+            { "type": "add", "target": "investigation", "value": 1 },
+            { "type": "toggleFlag", "target": "checked_desk" }
+          ]
+        },
+        {
+          "id": "hs_window",
+          "label": "查看窗户",
+          "targetScene": "corridor",
+          "x": 0.47, "y": 0.06, "width": 0.15, "height": 0.28
+        },
+        {
+          "id": "hs_closet",
+          "label": "检查衣柜",
+          "targetScene": "desk_detail",
+          "x": 0.33, "y": 0.48, "width": 0.10, "height": 0.26,
+          "conditions": [
+            { "variable": "investigation", "op": ">=", "value": 1 }
+          ],
+          "effects": [
+            { "type": "add", "target": "investigation", "value": 1 }
+          ]
+        }
+      ],
+      "choices": [
+        { "text": "离开房间", "targetScene": "corridor" }
+      ]
+    },
+    "corridor": {
+      "id": "corridor",
+      "videoUrl": "/videos/corridor.mp4",
+      "hotspots": [
+        {
+          "id": "hs_left",
+          "label": "走向左边通道",
+          "targetScene": "left_door",
+          "x": 0.02, "y": 0.30, "width": 0.30, "height": 0.45,
+          "showAt": 1.5,
+          "effects": [
+            { "type": "add", "target": "courage", "value": 5 }
+          ]
+        },
+        {
+          "id": "hs_center",
+          "label": "走向中间通道",
+          "targetScene": "trust_ending",
+          "x": 0.33, "y": 0.25, "width": 0.34, "height": 0.55,
+          "showAt": 3.0
+        },
+        {
+          "id": "hs_right",
+          "label": "走向右边通道",
+          "targetScene": "alone_ending",
+          "x": 0.68, "y": 0.30, "width": 0.30, "height": 0.45,
+          "showAt": 5.0
+        }
+      ]
+    },
     "left_door": {
       "id": "left_door",
       "videoUrl": "/videos/left_door.mp4",
@@ -92,6 +167,20 @@
         }
       ]
     },
+    "desk_detail": {
+      "id": "desk_detail",
+      "videoUrl": "/videos/continue_ending.mp4",
+      "choices": [
+        {
+          "text": "返回调查现场",
+          "targetScene": "investigation_site"
+        },
+        {
+          "text": "离开",
+          "targetScene": "corridor"
+        }
+      ]
+    },
     "stay": {
       "id": "stay",
       "videoUrl": "/videos/stay.mp4",