fix(release): skip crates.io, use cargo-dist installers

[skgbafa]

Why

The crates.io publish failed because tinycloud-node-server's path deps (e.g. tinycloud-auth) lack version specifiers. Publishing the binary requires publishing all internal workspace crates first. We're deferring that.

Changes

• release-plz.toml: publish = false for tinycloud-node (stops the failed publish loop)
• Cargo.toml: enable cargo-dist shell + powershell installers, add workspace.resolver = "2" to silence resolver warning
• Comments documenting future intent to publish to crates.io

Result

• Git tags + GitHub Releases still work
• Binaries built and attached to releases (4 targets)
• Users can install via shell installer (curl ... | sh) or download .tar.gz
• cargo install tinycloud-node won't work until we publish to crates.io
• cargo install --git still works (builds from source)

Next step (separate one-off)

Reserve the tinycloud-node name on crates.io by publishing a minimal v0.0.1 placeholder from a temp dir.