Creates a new strategy blueprint with an initial version.
x-api-key header (required)strategies:writeeip155:1/erc20:0xa0b8...). Allocation
weights are string percentages that must sum to 100.
Common error responses:
400 when the request body or spec is invalid401 when x-api-key header is missing or the key is invalid403 when the API key lacks the strategies:write scope500 on unexpected server errors