refactor: rename shell tool approvals crate

[ahmedhesham6]

Description

Rename the shell tool approvals crate to stakpak-shell-tool-approvals and update workspace references so the published package name matches the Stakpak namespace.

Changes Made

• rename the package in libs/shell-tool-approvals/Cargo.toml
• update workspace dependency references in Cargo.toml, libs/agent-core, and tui
• update Rust code references in libs/agent-core/src/types.rs and tui/src/services/auto_approve.rs
• refresh Cargo.lock
• add the renamed crate to the crates.io publish order in .github/workflows/build-and-release.yml

Testing

• cargo fmt --all -- libs/agent-core/src/types.rs tui/src/services/auto_approve.rs
• cargo check --workspace
• skipped cargo clippy ... -D warnings at user request because unrelated existing TUI warnings currently fail the run

Breaking Changes

• published crate name changes from shell-tool-approvals to stakpak-shell-tool-approvals