feat:更新练习题接口

agent/prompt.py

@@ -21,6 +21,7 @@ study_prompt = """
    - JSON 必须是合法格式，可被程序直接解析。
 
 4. **返回格式（严格遵循）**
+- select字段是用户实际选择的，永远为空数组
 [
   {
     "id": 1,
@@ -32,7 +33,8 @@ study_prompt = """
       "选项C内容",
       "选项D内容"
     ],
-    "answer": ["A"]
+    "answer": ["A"],
+    "select": []
   },
   {
     "id": 2,
@@ -44,7 +46,8 @@ study_prompt = """
       "选项C内容",
       "选项D内容"
     ],
-    "answer": ["A", "C"]
+    "answer": ["A", "C"],
+    "select": []
   }
 ]
 """