fix(serverless): drop activity and errorRate from apps list --sort

[Ryank90]

Summary

• apps list --sort now accepts only createdAt and name. activity and errorRate were cut from the MVP: the API enum still lists them, but the server returns 422 because those metrics are not collected yet.
• An unsupported sort is rejected locally, with the error naming the two sorts that work.

Test plan

• go test ./internal/cmd/serverless/ -run TestParseAppSort
• runware serverless apps list --help lists createdAt and name only
• runware serverless apps list --sort activity fails locally and does not call the API

[coderabbitai]

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