relay(stats): allow multi-segment --stats-node values; move cargo-deny to ci

[kixelated]

Summary

Two small unrelated changes that came up while reviewing --stats-node:

• relay(stats): treat the --stats-node value as a normalized path so multi-host regions can use values like sjc/1 and sjc/2 to nest under a shared region key without colliding on the advertised stats path. Stats::new now takes Option<PathOwned>; trailing/duplicate slashes are trimmed and an empty value after normalization collapses to None. Doc comments + the localhost.toml example call out the new shape explicitly.
• ci(rs): move cargo deny check --show-stats from just rs check to just rs ci so the inner-loop check stays fast and devs aren't blocked mid-edit by a fresh upstream advisory. CI still gets coverage because .github/workflows/check.yml invokes just ci.

Test plan

• cargo test -p moq-net --lib stats:: — 17 tests pass, including new advertised_path_multi_segment_node and new_normalizes_and_drops_empty_node cases
• cargo check -p moq-net -p moq-relay
• cargo clippy -p moq-net -p moq-relay --all-targets
• just rs check runs clean and no longer invokes cargo deny

(Written by Claude)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a264e7d4-a1ee-42ce-839e-49e8a7fe78c5

📥 Commits

Reviewing files that changed from the base of the PR and between 0fc1704 and 1ce31a3.

📒 Files selected for processing (4)

• demo/relay/localhost.toml
• rs/justfile
• rs/moq-net/src/stats.rs
• rs/moq-relay/src/stats.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/elastic-elbakyan-2aebd5

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch claude/elastic-elbakyan-2aebd5

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