Creates a new management contract between a property management company and one or more landlords.

A management contract defines the financial relationship between the property management
company and the landlord(s), including fee structures, minimums, and service terms.

The contract can be associated with a GLI provider to handle rental guarantee insurance
for properties managed under this contract.

You can associate landlords with the contract by using the management_contract[profile_contracts_attributes]
array in the request body
to control the landlord profile, bank account, and ownership share. Each entry accepts:

• profile_id: landlord profile identifier (public_id)
• bank_account_id: bank account identifier (public_id) that must belong to the same profile
• share: ownership share percentage (0-100). Defaults to 100 if not specified.
  For multiple landlords, shares should ideally sum to 100.

Once created, assets (properties) can be associated with this contract to be managed
according to the defined terms.