fix(ci): adapt cross-platform builds to Blacksmith runners

[zortos293]

Summary

• install the Linux D-Bus headers, Windows LLVM/libclang toolchain, and select the ARM64 GNU C++ linker required by the Blacksmith images
• discover SDL 3 from its install prefix so both Unix and Visual Studio generator layouts resolve correctly
• fix the macOS Rust/C++ portability errors exposed by the updated toolchains
• update the standalone streamer smoke check for the NVST handoff protocol introduced by fix(qt): render NVST frames in the Qt scene graph #787
• carry the same dependency and SDL discovery changes into release-candidate builds without weakening platform coverage or packaging assertions

Verification

• actionlint -color=false .github/workflows/auto-build.yml .github/workflows/qt-ci.yml .github/workflows/qt-release-candidate.yml
• cargo clippy --manifest-path native/opennow-streamer/Cargo.toml --workspace --all-targets -- -D warnings
• cargo test --manifest-path native/opennow-streamer/Cargo.toml --workspace
• cargo clippy --manifest-path native/opennow-core/Cargo.toml --all-targets -- -D warnings
• cargo test --manifest-path native/opennow-core/Cargo.toml
• npm --prefix opennow-stable run lint
• npm --prefix opennow-stable run typecheck
• npm --prefix opennow-stable test
• npm --prefix opennow-stable run native:build

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