Can a civilian auxiliary police officer from the Cyber ??Security Detachment of the Municipal Public Security Bureau be converted into a professional police officer?

It depends on your local area. This is a matter of local regulations, not a matter of national universality, let alone a matter of legal policy.

In some places, there are indeed quotas for becoming a full-time official, but it differs from place to place. Many require meritorious service before becoming a full-time official. Those with second-class merit will be transferred to the professional establishment, and those with first-class merit will be transferred to the civil service establishment.