fix: remove scene. prefix from textKey, add fallback to choice.text when locale key missing

public/scenes/demo.json

@@ -81,7 +81,7 @@
       "choices": [
         {
           "text": "走向左边那扇发光的门",
-          "textKey": "scene.intro.choice.left_door",
+          "textKey": "intro.choice.left_door",
           "targetScene": "left_door",
           "effects": [
             { "type": "add", "target": "courage", "value": 10 }
@@ -89,7 +89,7 @@
         },
         {
           "text": "走向右边那扇普通的门",
-          "textKey": "scene.intro.choice.right_door",
+          "textKey": "intro.choice.right_door",
           "targetScene": "right_door",
           "effects": [
             { "type": "add", "target": "courage", "value": -5 }
@@ -97,12 +97,12 @@
         },
         {
           "text": "仔细搜索房间",
-          "textKey": "scene.intro.choice.search",
+          "textKey": "intro.choice.search",
           "targetScene": "investigation_site"
         },
         {
           "text": "留在原地，什么也不做",
-          "textKey": "scene.intro.choice.stay",
+          "textKey": "intro.choice.stay",
           "targetScene": "stay"
         }
       ]
@@ -193,7 +193,7 @@
       "choices": [
         {
           "text": "与陌生人握手",
-          "textKey": "scene.left_door.choice.handshake",
+          "textKey": "left_door.choice.handshake",
           "prompt": "陌生人会记住你的善意",
           "targetScene": "trust_ending",
           "effects": [
@@ -296,7 +296,7 @@
       "choices": [
         {
           "text": "开启信任的旅程（需要 trust >= 80）",
-          "textKey": "scene.trust_ending.choice.journey",
+          "textKey": "trust_ending.choice.journey",
           "prompt": "你们的羁绊将改变一切",
           "targetScene": "secret_ending",
           "conditions": [