When I bought a house in 2008, the purchase contract said "commercial and residential use", but only "hotel" was displayed after the real estate license was processed. Is it a breach of contract?

First of all, you bought a commercial house, which belongs to that kind of hotel-style apartment. This kind of house has no specific unit number. This is not a breach of contract in terms of billing, because they are commercial products and they are right.

Commercial housing will not have a specific unit number.

As for the extra area, you can pay it or not.

This kind of house can't be sold, only occupied and rented. Specific rights protection? I'm not sure. It should be, the problems you mentioned above can't be maintained.