feat: add Debian package (.deb) build for APT distribution

[Copilot]

Packages Renderflow as a .deb for installation via dpkg/APT, targeting Linux x86_64.

Changes

• Cargo.toml — adds [package.metadata.deb] section consumed by cargo-deb: maintainer, license, extended description, and asset mapping (target/release/renderflow → /usr/bin/renderflow)
• .github/workflows/ci.yml — adds package-deb job (tag-triggered) that builds the release binary natively, runs cargo deb --no-build, and uploads the resulting .deb to both workflow artifacts and the GitHub Release
• Taskfile.yml — adds package-deb task for local builds (requires cargo install cargo-deb)

Usage

# Local build
task package-deb

# Install
sudo dpkg -i target/debian/renderflow_*.deb
renderflow --help

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