Creates a new strategy with an initial allocation version.
x-api-key header (required)strategies:writeeip155:1/erc20:0xa0b8...). Allocation
weights are string percentages that must sum to 100.
The request version field controls the request format — currently only 1.
Schedule and preferences are stored separately and can be updated independently
via PUT /v2/strategies/:id/schedule and PUT /v2/strategies/:id/preferences.
Common error responses:
400 when the request body or allocation 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