fix(api): Add custom JSON marshaling for InstancePrototype interface fields #134
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Instance provisioning fails with "Expected only one oneOf fields to be set: got 0" errors when using InstancePrototype types with interface-typed fields.
Go's default JSON marshaling omits interface-typed fields in certain contexts. oneOf discriminator fields (image, zone, vpc, primary_network_attachment) are missing from the JSON payload, causing VPC API validation to fail.
This commit adds custom MarshalJSON methods to 8 InstancePrototype variant types that explicitly serialize all fields including interface types.
Fixes: #133