Fix partial backup/restore API to remap addons key to apps

The external API accepts `addons` as the request body key (since
ATTR_APPS = "addons"), but do_backup_partial and do_restore_partial
now take an `apps` parameter after the rename. The **body expansion
in both endpoints would pass `addons=...` causing a TypeError.

Remap the key before expansion in both backup_partial and
restore_partial:

    if ATTR_APPS in body:
        body["apps"] = body.pop(ATTR_APPS)

Also adds test_restore_partial_with_addons_key to verify the restore
path correctly receives apps= when addons is passed in the request
body. This path had no existing test coverage.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: mdegat01

supervisor/api/backups.py

@@ -335,6 +335,8 @@ async def backup_partial(self, request: web.Request):
         if body.get(ATTR_APPS) == ALL_ADDONS_FLAG:
             body[ATTR_APPS] = list(self.sys_apps.local)
 
+        if ATTR_APPS in body:
+            body["apps"] = body.pop(ATTR_APPS)
         background = body.pop(ATTR_BACKGROUND)
         backup_task, job_id = await background_task(
             self, self.sys_backups.do_backup_partial, **body
@@ -380,6 +382,8 @@ async def restore_partial(self, request: web.Request):
             request, body.get(ATTR_LOCATION, backup.location)
         )
         background = body.pop(ATTR_BACKGROUND)
+        if ATTR_APPS in body:
+            body["apps"] = body.pop(ATTR_APPS)
         restore_task, job_id = await background_task(
             self, self.sys_backups.do_restore_partial, backup, **body
         )

tests/api/test_backups.py

@@ -14,6 +14,7 @@
 
 from supervisor.addons.addon import App
 from supervisor.backups.backup import Backup, BackupLocation
+from supervisor.backups.manager import BackupManager
 from supervisor.const import CoreState
 from supervisor.coresys import CoreSys
 from supervisor.docker.manager import DockerAPI
@@ -1535,3 +1536,28 @@ async def test_pre_post_backup_command_error(
         "exit_code": 1,
         "debug_logging_command": "ha supervisor options --logging debug",
     }
+
+
+async def test_restore_partial_with_addons_key(
+    api_client: TestClient,
+    coresys: CoreSys,
+    mock_partial_backup: Backup,
+):
+    """Test that partial restore accepts 'addons' key in request body and remaps it to 'apps'."""
+    await coresys.core.set_state(CoreState.RUNNING)
+    coresys.hardware.disk.get_disk_free_space = lambda x: 5000
+
+    with patch.object(
+        BackupManager, "do_restore_partial", return_value=True
+    ) as mock_restore:
+        resp = await api_client.post(
+            f"/backups/{mock_partial_backup.slug}/restore/partial",
+            json={"addons": ["local_ssh"]},
+        )
+
+    assert resp.status == 200
+    mock_restore.assert_called_once()
+    _, call_kwargs = mock_restore.call_args
+    assert "apps" in call_kwargs
+    assert call_kwargs["apps"] == ["local_ssh"]
+    assert "addons" not in call_kwargs