fix(prism-lium): hard-reject multi-GPU offers for single-GPU rent

[echobt]

Summary

• Prism Lium provisioning previously accepted any offer with gpu_count >= requested and, on host-split failures, retried rent with the offer’s full GPU count — so 8× RTX 5090 hosts could be selected/billed when the spec asked for 1×.
• Hard-reject multi-GPU offers (numeric count and 8x / 8× / x8 labels); prefer exact single-GPU 5090; never rent more GPUs than InstanceSpec.gpu_count.
• Unit tests: 1×5090 wins over cheaper 8×5090; all-multi catalogs yield NoCapacity.

Test plan

• cargo test -p prism-lium-types --lib
• cargo test -p prism-lium --lib
• cargo clippy -p prism-lium-types -p prism-lium --all-targets -- -D warnings
• CI green
• After merge: deploy prod prism-challenge image before relaunching affected miner submission

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📥 Commits

Reviewing files that changed from the base of the PR and between 7441dcf and a1ee2a1.

📒 Files selected for processing (4)

• crates/prism-lium-types/src/lib.rs
• crates/prism-lium-types/src/types.rs
• crates/prism-lium/src/client.rs
• crates/prism-lium/src/lib.rs

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