Add cost estimation per function deployment

[depadeto]

Context

When deploying a function, users should see an estimated cost before confirming.

Task

• Add GPU pricing data (approximate $/hr for A100, H100, L40S, A10G across AWS/GCP/Azure)
• Show estimated monthly cost in the Deploy modal based on: GPU type × count × min replicas × cloud
• Show cost comparison between clouds (e.g., "AWS: ~$X/mo, GCP: ~$Y/mo")

Files

• frontend/src/App.jsx — DeployModal component
• Could add a pricing.json data file

This helps users make informed deployment decisions.