generate_registry: support absolute .deb Filename (Releases-hosted)

[eggfly]

Why

CardputerZero/packages now serves .deb from a GitHub Release (LFS budget exhausted). The Pages Packages index Filename becomes an absolute URL (e.g. https://github.com/CardputerZero/packages/releases/download/apt-pool/<asset>.deb) instead of an in-repo path. The current generator hardcodes download.url = https://github.com/CardputerZero/packages/raw/main/{filename}, which would produce a broken .../raw/main/https://github.com/... link.

Depends on CardputerZero/packages#51 and m5stack/CardputerZero-AppBuilder#4.

Change

scripts/generate_registry.py: if Filename is already an absolute http(s) URL, use it verbatim for download.url; otherwise fall back to the legacy raw-content path. Icon/screenshot asset resolution is unchanged.

Test

Ran the generator locally against a synthetic Packages with absolute release Filename + real meta.json:

lofibox  https://github.com/CardputerZero/packages/releases/download/apt-pool/lofibox_0.2.0-1.lofibox23_arm64.deb  size=9077082
nc2000   https://github.com/CardputerZero/packages/releases/download/apt-pool/nc2000_1.0.3_arm64.deb               size=20560444

download.url now points at the release asset; download.size/sha256 preserved; assets still resolve via raw github.

Test plan

• Merge packages#51 first, then trigger Sync Registry from Packages (workflow_dispatch) and confirm generated/registry.json download URLs point at the release.

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