fix(serverless): show why a deploy was refused for credit

[Ryank90]

Summary

• Decode a 402 shortfall as a money amount (amount and currency) instead of a string, so a refused deploy no longer fails with a JSON unmarshal error.
• Print the API detail, which says whether credit cannot cover the request or the account is suspended, plus the shortfall to add before retrying.

Test plan

• go test -race ./internal/api/serverless/
• make lint
• With a negative balance, runware serverless deploy reports the credit detail and shortfall instead of cannot unmarshal object into Go struct field ProblemDetails.shortfall
• With a suspended account, the same command reports that credit is suspended

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