Allow hosts to count infants toward max guests or customize Direct booking widget infant wording

On Direct bookings (Airbnb-style), infants do not count toward max guest capacity or extra-guest fees. The booking widget also shows fixed copy: This property hosts a maximum of X guests (not including infants).

Hosts currently can only toggle Allow infants on/off in Property Details → Rules. They cannot:

• Make infants count toward max guest capacity

• Customize or remove the "(not including infants)" widget text

Requested capabilities:

• Host setting to include infants in max guest count (and extra-guest fee calculation), or keep current Airbnb-style behavior

• Host control over whether the infant disclaimer appears on the booking widget

Raised from internal product inquiry — several hosts may want flexibility here beyond the current on/off infant allowance toggle.