Use backend callable QA for H5 answers

hy_qa_asset_backend/frontend/lib/h5MockQa.ts

@@ -51,7 +51,7 @@ export const initialMessages: ChatMessage[] = [
     role: "assistant",
     content:
       "你好，我是千问千答助手。你可以把最近遇到的亲子、关系、情绪或行动问题发给我，我会优先基于已审核的答疑资产给你一个可落地的回应。",
-    boundary: "当前为 H5 体验版，登录与个性化记录暂用 mock 数据。",
+    boundary: "当前为 H5 体验版，登录暂用 mock 占位；问答答案只读取后端可调用库。",
     createdAt: "09:30"
   }
 ];
@@ -82,57 +82,6 @@ export function summarizeSession(sessionId: string, messages: ChatMessage[]): Ch
   };
 }
 
-export const mockCallableQa: CallableQAItem[] = [
-  {
-    id: 9001,
-    standard_code: "MOCK-001",
-    standard_question: "孩子一写作业就发脾气，家长应该怎么办？",
-    standard_answer:
-      "先不要急着纠正行为，建议先区分两件事：孩子是在逃避任务，还是被情绪淹没了。可以先用一句很短的话接住情绪，比如“我看到你现在很烦，先停两分钟”。等情绪下降后，再把任务拆小，只约定下一步，而不是一次性要求全部完成。",
-    similar_questions: ["孩子写作业崩溃怎么办", "孩子学习时情绪大怎么办"],
-    primary_topic: "亲子关系",
-    problem_tags: ["情绪接纳", "作业冲突", "边界"],
-    course_stage: "大本营综合",
-    audience_tags: ["家长"],
-    answer_boundary: "不替代心理诊断；如果孩子长期极端失控，建议寻求专业支持。",
-    forbidden_expressions: ["保证有效", "一定改变"],
-    source_raw_qa_id: 9001,
-    session_id: 9001
-  },
-  {
-    id: 9002,
-    standard_code: "MOCK-002",
-    standard_question: "知道要行动但总是拖延，应该怎么开始？",
-    standard_answer:
-      "拖延时不要先给自己贴标签，可以先把目标缩小到“今天能完成的最小动作”。比如不是要求自己完整学习一小时，而是先打开资料、看 5 分钟、记一句话。行动力常常不是靠情绪准备好了才开始，而是靠一个足够小的开始把状态带起来。",
-    similar_questions: ["总是拖延怎么办", "行动力差怎么调整"],
-    primary_topic: "个人成长",
-    problem_tags: ["行动力", "拖延", "自我要求"],
-    course_stage: "觉知",
-    audience_tags: ["学员"],
-    answer_boundary: "只提供学习和自我观察建议，不承诺课程效果。",
-    forbidden_expressions: ["一定改变", "保证有效"],
-    source_raw_qa_id: 9002,
-    session_id: 9002
-  },
-  {
-    id: 9003,
-    standard_code: "MOCK-003",
-    standard_question: "伴侣不愿意沟通时，如何降低冲突？",
-    standard_answer:
-      "可以先把“让对方马上理解我”调整成“先让对话能继续”。表达时尽量少用评判句，多用事实加感受，比如“刚才你直接走开，我有点失落，也有点不知道怎么继续”。如果对方暂时不想谈，可以约一个明确时间，而不是追着当场解决。",
-    similar_questions: ["伴侣拒绝沟通怎么办", "夫妻沟通容易吵架怎么办"],
-    primary_topic: "婚姻关系",
-    problem_tags: ["沟通", "冲突降温", "关系边界"],
-    course_stage: "原生",
-    audience_tags: ["伴侣关系"],
-    answer_boundary: "不做法律判断；涉及暴力或安全风险时应优先保护自身安全。",
-    forbidden_expressions: ["法律上必然", "一定改变"],
-    source_raw_qa_id: 9003,
-    session_id: 9003
-  }
-];
-
 function scoreQuestion(question: string, qa: CallableQAItem): number {
   const haystack = [
     qa.standard_question,
@@ -149,7 +98,9 @@ function scoreQuestion(question: string, qa: CallableQAItem): number {
 }
 
 export function findQaAnswer(question: string, qaItems: CallableQAItem[]) {
-  const candidates = qaItems.length > 0 ? qaItems : mockCallableQa;
-  const [best] = [...candidates].sort((left, right) => scoreQuestion(question, right) - scoreQuestion(question, left));
-  return best ?? mockCallableQa[0];
+  if (qaItems.length === 0) {
+    return null;
+  }
+  const [best] = [...qaItems].sort((left, right) => scoreQuestion(question, right) - scoreQuestion(question, left));
+  return best ?? null;
 }