feat: 自适应支线插入引擎（WIP：scoring/branching 抽取、挂点重定向、10 条支线 JSON、决策落库）

src/services/jev.ts

@@ -59,6 +59,7 @@ export type JevAnswer =
     };
 
 export interface JevClient {
+  adaptiveScoring?: boolean;
   ask(state: unknown, questions: Record<string, JevQuestion>): Promise<Record<string, JevAnswer>>;
 }
 
@@ -86,6 +87,7 @@ export class HttpJevClient implements JevClient {
       headers.Authorization = `Bearer ${this.apiKey}`;
     }
     const res = await fetch(url, {
+      signal: AbortSignal.timeout(15000),
       method: 'POST',
       headers,
       body: JSON.stringify({ model: 'jev-latest', state, questions } satisfies JevRequest),
@@ -121,6 +123,7 @@ function prng(seed: number, n: number): number[] {
 
 /** 无 key 开发用：确定性伪随机返分（同一输入永远同一输出，输出形状与真实 API 对齐）。 */
 export class MockJevClient implements JevClient {
+  adaptiveScoring = true;
   async ask(state: unknown, questions: Record<string, JevQuestion>): Promise<Record<string, JevAnswer>> {
     const stateKey = JSON.stringify(state) ?? '';
     const answers: Record<string, JevAnswer> = {};
@@ -177,6 +180,7 @@ export function getJevClient(): JevClient {
   } else {
     console.warn('[jev] 未配置 VITE_JEV_PROXY_URL / VITE_TYPESAFE_API_KEY，降级为 MockJevClient（确定性伪随机返分）');
     singleton = new MockJevClient();
+    singleton.adaptiveScoring = false;
   }
   return singleton;
 }