fix(providers): sync deepseek and zai locks with llm-router 1.4.2

[ytallo]

The standalone provider lockfiles still pinned llm-router 1.4.1 after the path dependency was bumped to 1.4.2, so every --locked build of provider-deepseek and provider-zai fails with:

error: cannot update the lock file .../provider-deepseek/Cargo.lock because --locked was passed to prevent this

This is what broke last night's Harness E2E Daily (run 31078732959) at the Build source E2E stack step — the daily builds provider-$provider for every subject/judge provider with --locked, and the current matrix is deepseek subject + zai judge.

Regenerated both locks with cargo metadata; the only change is llm-router 1.4.1 → 1.4.2 in each. Verified locally: cargo metadata --locked passes for both, and cargo check --locked compiles provider-deepseek clean. Same drift class previously fixed in 8d053c2.

Note: the Aug 4/5 daily failures are unrelated (shell_coder_sandbox hard-gate failures, already being addressed on fix/harness-shell-coder-e2e-improvement).

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