fix(serverless): reject an invalid --gpus-per-worker before upload

[Ryank90]

Summary

• Reject --gpus-per-worker values other than 1, 2, 4, or 8 on deploy and apps scale before any request is sent.
• Deploy checks the flag before packing and uploading the source archive, so a bad count no longer spends an upload and then fails with 422.

Test plan

• go test ./internal/cmd/serverless/ -run 'ValidateGPUsPerWorker|WorkerConfigPatchFromFlags'
• runware serverless deploy ./app.py --id my-app --gpu-type h100 --gpus-per-worker 3 fails locally and does not upload
• --gpus-per-worker 2 and 4 are still accepted

[coderabbitai]

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