feat: tell FTW it runs as the Home Assistant bundle

[HuggeK]

What

Identify this image to FTW as the Home Assistant bundle so the FTW web UI can show a single bundled FTW version in Settings → System, instead of the per-container Core/Optimizer breakdown (with Update/Rollback buttons that Supervisor-managed installs can't use).

This sets the FTW_BUNDLE / FTW_BUNDLE_VERSION env contract in three places, defence-in-depth:

• ftw/config.yaml — declares FTW_BUNDLE=home_assistant_addon in the add-on environment.
• ftw/Dockerfile — bakes FTW_BUNDLE and FTW_BUNDLE_VERSION=${BUILD_VERSION} into the image ENV.
• ftw/run.sh — re-exports FTW_BUNDLE=home_assistant_addon alongside the existing self-update/transport hardening, so an injected environment can't make Core present itself as anything but the bundle.

Docs updated (ftw/DOCS.md, ftw/CHANGELOG.md).

Why

The add-on ships Core + Optimizer in one image and Supervisor owns update/rollback, so the per-container version breakdown and update buttons are misleading here. The single "bundled FTW version" answers the question users actually have: which FTW is this add-on?

Companion PR

The UI rendering that reads this contract lives upstream in Core: srcfl/ftw#701. This add-on change is the producer side of the contract.

Rollout / no-op note

FTW_BUNDLE is unknown to the currently pinned Core (v1.10.0-beta.1, per compatibility.yaml), which simply ignores the extra env vars — so this is a no-op until a Core release containing srcfl/ftw#701 is pinned. Merging it now means the add-on is ready the moment that Core bump lands, with no second change needed.

Testing

• python scripts/validate.py passes.
• Diff is limited to the ftw/ add-on wrapper; no runtime code paths changed for the current pinned Core.

[miravoss26]

Small and clean. Adds FTW_BUNDLE=home_assistant_addon (+ FTW_BUNDLE_VERSION) across the Dockerfile, config.yaml and run.sh so the FTW web UI reports one bundled version instead of a per-container breakdown. Docs + changelog match.

Nice touch: the run.sh export is belt-and-suspenders against an injected env flipping the bundle identity, same pattern as the existing self-update/transport guards. All five checks green.

Safe to merge from my read, no security surface. Not on my auto-merge allowlist, so leaving the button to a human.

[miravoss26]

Sets the FTW_BUNDLE=home_assistant_addon / FTW_BUNDLE_VERSION env contract in three places (config.yaml, Dockerfile ENV, run.sh export) plus CHANGELOG + DOCS, so the FTW web UI reports one bundled version instead of the per-container Core/Optimizer breakdown with update buttons Supervisor can't use.

Small and coherent. The three-place defence-in-depth matches the existing self-update/transport hardening in run.sh. No secrets, no new deps, no network or authz surface. CI green. Safe to merge from my read.