Fix IPU7 camera rebuilds across jsoncpp ABI changes

[iuliansafta]

Problem

The RC channel upgraded jsoncpp from 1.9.6 (libjsoncpp.so.26) to 1.9.8 (libjsoncpp.so.27), while intel-ipu7-camera 1.0.5-1 remained linked to .26. ipu75xa.so could no longer load, leaving the IPU7 V4L2 relay present but unable to produce frames.

Fix

• Mark intel-ipu7-camera as a fast-ring package so it is built against each channel's own dependency set rather than carrying an artifact across incompatible channel ABIs.
• Track jsoncpp through rebuild_on, allowing the existing rebuild automation to bump the package when that dependency moves.
• Depend on the libjsoncpp.so soname provider rather than only the unversioned package name, exposing ABI compatibility to package metadata.
• Bump pkgrel to 2 so corrected artifacts are published now.

Fixes omacom/omarchy#10837.

Verification

• ./bin/sync-rebuilds intel-ipu7-camera generated the pkgrel bump and x86_64 dependency record.
• ./bin/sync-rebuilds --self-test
• ./bin/omarchy-pkgs self-test
• bash -n pkgbuilds/intel-ipu7-camera/PKGBUILD
• makepkg --printsrcinfo reports depends = libjsoncpp.so.
• git diff --check

A full IPU7 package build is intentionally left to the repository's native per-channel builders because the package includes kernel DKMS modules and proprietary camera components.