feat: choice conditions with variables, demo updates, roadmap update

public/scenes/demo.json

@@ -146,6 +146,8 @@
       "choices": [
         {
           "text": "与陌生人握手",
+          "textKey": "scene.left_door.choice.handshake",
+          "prompt": "陌生人会记住你的善意",
           "targetScene": "trust_ending",
           "effects": [
             { "type": "add", "target": "trust", "value": 30 }
@@ -238,6 +240,8 @@
       "choices": [
         {
           "text": "开启信任的旅程（需要 trust >= 80）",
+          "textKey": "scene.trust_ending.choice.journey",
+          "prompt": "你们的羁绊将改变一切",
           "targetScene": "secret_ending",
           "conditions": [
             { "variable": "trust", "op": ">=", "value": 80 }