初始化dev

src/main/resources/mapper/AIClientService.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.qingqiu.interview.mapper.InterviewSessionMapper">
+
+    <select id="selectBySessionId" resultType="com.qingqiu.interview.entity.InterviewSession">
+        SELECT * FROM interview_session 
+        WHERE session_id = #{sessionId} AND deleted = 0
+    </select>
+
+    <select id="selectActiveSessionsByModel" resultType="com.qingqiu.interview.entity.InterviewSession">
+        SELECT * FROM interview_session 
+        WHERE ai_model = #{aiModel} AND status = 'ACTIVE' AND deleted = 0
+        ORDER BY created_time DESC
+    </select>
+
+    <update id="updateSessionStatus">
+        UPDATE interview_session 
+        SET status = #{status}, updated_time = NOW()
+        WHERE session_id = #{sessionId}
+    </update>
+
+    <select id="countRecentInterviews" resultType="com.qingqiu.interview.dto.DashboardStatsResponse$DailyStat">
+        SELECT DATE(created_time) as date, COUNT(*) as count
+        FROM interview_session
+                WHERE created_time >= DATE_SUB(NOW(), INTERVAL #{days} DAY)
+        GROUP BY DATE(created_time)
+        ORDER BY date ASC
+    </select>
+
+</mapper>