Enhance authentication logging and update MyBatis configuration

target/classes/mapper/account/UserAccountMapper.xml

@@ -21,5 +21,11 @@
           AND user_type = #{userType}
         LIMIT 1
     </select>
-</mapper>
 
+    <select id="findByUsername" resultMap="UserAccountMap">
+        SELECT id, user_type, username, display_name, password_hash, role, status, points_balance, created_at, updated_at
+        FROM user_account
+        WHERE username = #{username}
+        LIMIT 1
+    </select>
+</mapper>