Get a team's demand configuration: for each role, the extra columns POST /v1/forecasting/demand accepts and the values each allows.

• An axis with mode: "column" is an upload column. column is its CSV header or JSON key, and values are the values a cell accepts, matched exactly. An empty cell means any value.
• An axis with mode: "ratio" is a fixed split of the role's demand across the values of a licensed-region skill, used when demand is filtered by region. It is not an upload column.

roleAxis is how the team's demand maps to its roles.