Refactor install scripts for LITE arm64 (trixie)

[mgrouch]

Motivation

• Consolidate repeated checks and LITE-specific behavior into a shared helper so the installer only targets Raspberry Pi arm64 on the trixie-based LITE build.
• Reduce duplication and remove branches for the full build to make the LITE flow simpler, safer and easier to maintain.

Description

• Add install-scripts/lib/common.sh that exports defaults (BBN_KIND="LITE", LMARCH="arm64", BBN_OS_CODENAME="trixie") and provides helpers require_root, require_arch, require_trixie, skip_if_lite, and log.
• Update install-scripts/install.sh to source the shared helper, enforce root/arch/os-codename via require_*, use SCRIPT_DIR for locating stage scripts, and report BBN_KIND consistently.
• Rework many stage scripts to source the new helper and either use LITE-specific actions (desktop scripts, servicedialog-lite, trimmed Signal K plugin set) or call skip_if_lite to no-op optional/full components (motioneye, mopidy, radio/SDR, many 8-apps/* scripts).
• Simplify cleanup in install-scripts/a-cleanup/00-cleanup.sh and remove multi-branch logic so LITE cleanup is consistently applied and /etc/bbn-lite is written.

Testing

• No automated tests were run on these changes.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/refactor-scripts-for-raspberry-pi-arm64

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