Refactor server-rs runtime and update related docs

docs/prd/AI_NATIVE_AGENT_FIRST_CUSTOM_WORLD_CREATOR_PHASE4_IMPLEMENTATION_PLAN_2026-04-14.md

@@ -307,7 +307,6 @@
 
 1. `name`
 2. `description`
-3. `dangerLevel`
 
 ## 7.4 第四阶段不允许编辑的内容
 
@@ -425,7 +424,6 @@
 1. `id`
 2. `name`
 3. `description` 或 `summary`
-4. `dangerLevel`
 5. `purpose`
 6. `mood`
 

docs/prd/AI_NATIVE_AGENT_FIRST_CUSTOM_WORLD_CREATOR_PHASE6_IMPLEMENTATION_PLAN_2026-04-14.md

@@ -505,7 +505,6 @@ draftProfile.landmarks.find(...)
     kind: 'camp' | 'landmark';
     name: string;
     description: string;
-    dangerLevel?: string;
     imageSrc?: string;
   };
   onPublishSuccess: (payload) => void;

docs/prd/AI_NATIVE_SCENE_MULTI_ACT_CREATOR_AND_GAMEPLAY_FLOW_PRD_2026-04-20.md

@@ -213,7 +213,6 @@
 1. 开局场景允许配置的字段必须与普通场景一致，至少包括：
    - `name`
    - `description`
-   - `dangerLevel`
    - `imageSrc`
    - `sceneNpcIds`
    - `connections`