Create orders DRY-RUN

Parse the workbook's Order sheet into a reviewable plan: each order is named per the convention and its line items are linked to creatives and audiences already created through the portal. Nothing is created and no budget is spent.

“Create orders” makes real DSP orders in INACTIVE state — they don’t deliver or spend until activated in the console. Line items + creative/audience attachment are not auto-created yet (the line-item API contract is pending); resolved links are recorded per order.