chore(ci): migrate from Shipfox to Namespace.so runners

[flemzord]

Summary

Migrate CI runners from Shipfox to Namespace.so as part of the org-wide CI infrastructure migration.

Per-workflow changes

• runs-on: shipfox-Xvcpu-ubuntu-2404 → runs-on: namespace-profile-linux-amd64-Xvcpu
• actions/checkout@v6 → namespacelabs/nscloud-checkout-action@v7 (git mirror caching)
• docker/setup-qemu-action removed (Namespace builds AMD64+ARM64 natively without emulation)
• docker/setup-buildx-action → namespacelabs/nscloud-setup-buildx-action@v0 (Remote Builders)

Composite changes

• nix-community/cache-nix-action removed (incompatible with Namespace runner setup)
• actions/cache → namespacelabs/nscloud-cache-action@v1 (paths preserved)

Validation

• Reference migration: chore(ci): migrate runners from Shipfox to Namespace.so ledger#1336 plus 4× banking-bridge + 16 other repos already merged or green.

Test plan

• CI passes on this PR
• No regression in build duration vs prior shipfox runs

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/migrate-ci-shipfox-to-namespace

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