feat(serverless): sync OpenAPI 0.6.0 and treat 402 as quota

[Ryank90]

Summary

• Update the serverless OpenAPI copy for 0.6.0: 402 PaymentRequired + shortfall, effectiveMaxWorkers, log sort/prevCursor, worker q, and gpusPerWorker 1|2|4|8.
• Regenerate the client and map HTTP 402 to paymentRequired so create, scale, activate, and resume print the credit shortfall as a quota error instead of a server error.
• Add a typed ListAppErrors wrapper for the request-error page.

Test plan

• go test ./internal/api/serverless/
• make test
• make lint
• Confirm a live 402 from create/scale/activate/resume prints shortfall and is categorized as quota

[coderabbitai]

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