Post an inference job

curl -X POST https://api.alpenglow.xyz/v1/infer \
  -H "X-402-PAYMENT: usdc:5L4n...q3w7" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "llama-3.1-70b",
    "prompt": "Summarise the whitepaper of project X ...",
    "sla": "Verified",
    "max_latency_ms": 500,
    "max_price_alpen": 1.5
  }'

Every job emits a signed Proof-of-Inference receipt on Solana with verifier kind, latency, and clearing price.