Bump Fedora template to 43 and enhance container installation tooling. Persist DIAGNOSTICS setting and introduce post_progress_to_api() to send lightweight telemetry pings from inside containers (fire-and-forget, enabled when DIAGNOSTICS=yes and RANDOM_UUID set). Harden package management flows: re-detect PKG_MANAGER when commands are missing, add apt mirror fallback logic (apt_update_safe) and more robust apt-cacher proxy parsing. Fix Debian 13 LXC root ownership bug (chown /) and add additional DNS/Git host checks (including api.github.com). Improve downloading and validation of tools.func, add multiple post_progress_to_api hooks to signal progress, and add two new install entrypoints (misc/main/install.func and misc/main/alpine-install.func) that consolidate network checks, OS updates, MOTD/SSH setup and container customization.
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