fix: drop zip_release until HACS builds a valid asset URL for versioned installs

Installing a specific version from the HACS catalog fails: HACS composes the
zip_release asset URL from its internal ref 'tags/<version>' without
stripping the prefix (hacs/integration base.py:932 -> download_zip_files ->
github_release_asset), requesting releases/download/tags/v1.68.0/... which
GitHub cannot serve. A mirror tag with a slash is not servable either.
Without zip_release HACS falls back to the regular tag-tree download that
worked before 2026-08-08. Release assets keep being attached
(release-zip.yml untouched) so re-enabling after the upstream fix is a
one-line revert.

Issue: #325
User-Visible: no

hacs.json

@@ -1,7 +1,5 @@
 {
   "name": "House Plan (card + storage)",
   "render_readme": true,
-  "homeassistant": "2024.6.0",
-  "zip_release": true,
-  "filename": "houseplan.zip"
+  "homeassistant": "2024.6.0"
 }