fix(cli, api): replace stale Re:infer branding with UiPath IXP in user-facing strings - #454

The re CLI still opened with reinfer-cli 0.42.0 / "re is the command line interface to reinfer clusters", and every re config subcommand described "the reinfer config file" — while the README had already moved to UiPath IXP. This sweeps the user-facing strings over.

• re --help / re --version now print re 0.42.0 (name = "re" on the root structopt — the crate is still reinfer-cli, and the binary was always re)
• Root about, the config about, and the seven re config help strings
• Both crate descriptions — the crates.io/docs.rs blurbs, and the Debian Description: via cargo deb
• api/README.md, the RetryConfig rustdoc, and the README logo's alt text

Deliberately unchanged as compatibility surfaces rather than branding: the reinfer-cli/reinfer-client crate names, ~/.config/reinfer, REINFER_CLI_NUM_THREADS, reinfer.dev endpoint handling, the reinfer_ URL path segment (including the parse-from-url error text that quotes it), and the internal ReinferConfig symbols. --reinfer-tenant-id on re create quota keeps its name and its help text — it labels an ID namespace (TenantId::Reinfer vs TenantId::UiPath) and is mutually exclusive with --uipath-tenant-id, so rebranding just the help would make the two flags read as the same thing.

Left for a separate call: authors = ["reinfer Ltd. <eng@reinfer.io>"] in both manifests (an attribution record, and the .deb Maintainer:), and the hero image — still the Re:infer GitHub org avatar, only its alt text changed here.

Verified by walking all 71 help pages and the generated zsh/bash completions: the only reinfer left is the four exclusions above. scripts/check-versions, cargo fmt --check and cargo clippy --all-targets -D warnings pass. No runtime behaviour changes and nothing asserts on help text, so no new tests — cargo test needs a live cluster and is left to CI.

RE-12805