fix(vm_provision_mixin): storage 'enabled' absent means enabled, not disabled

Proxmox's /storage API omits the "enabled" key entirely for storages that
were never explicitly toggled, rather than defaulting it to 1 — it isn't
present-and-falsy, it's just absent. Both _find_default_image_storage and
the snippet-storage discovery treated storage.get("enabled") as truthy-check,
so every storage without an explicit "enabled": 1 was silently excluded.

Confirmed live against a real Proxmox test server: local-lvm, local-zfs, and
fast-zfs all had content=images with no "enabled" key at all, causing
create_vm_from_cloud_init to always fail with "No storage with
content='images' found" despite multiple valid storages existing. All prior
tests used "enabled": 1 explicitly in their fixtures, masking the bug.

Fix: storage.get("enabled", 1) != 0 — absent or truthy means enabled, only
an explicit 0 excludes it. 4 new regression tests, 28 total pass.

tests/test_vm_provision_mixin.py

@@ -639,3 +639,103 @@ def test_download_cloud_image_checksum_mismatch_raises_and_removes_file():
 
     commands = [c[0][0] for c in mixin._run_node_command.call_args_list]
     assert any(cmd.startswith("rm -f") for cmd in commands)
+
+
+# ---------------------------------------------------------------------------
+# _find_default_image_storage
+# ---------------------------------------------------------------------------
+
+
+def test_find_default_image_storage_treats_absent_enabled_as_enabled():
+    """Proxmox omits "enabled" entirely for storages never explicitly toggled —
+    absent must mean enabled, not disabled. Regression: this was previously
+    treated as falsy, causing every real Proxmox server to report no usable
+    image storage even when several existed."""
+    mixin = ProxmoxVMProvisionMixin()
+    mixin._api = MagicMock()
+    mixin._api.storage.get.return_value = [
+        {"storage": "local-lvm", "type": "lvmthin", "content": "images,rootdir"},
+    ]
+
+    storage = mixin._find_default_image_storage()
+
+    assert storage == "local-lvm"
+
+
+def test_find_default_image_storage_excludes_explicitly_disabled():
+    mixin = ProxmoxVMProvisionMixin()
+    mixin._api = MagicMock()
+    mixin._api.storage.get.return_value = [
+        {"storage": "old-storage", "type": "dir", "content": "images", "enabled": 0},
+        {"storage": "local-lvm", "type": "lvmthin", "content": "images,rootdir", "enabled": 1},
+    ]
+
+    storage = mixin._find_default_image_storage()
+
+    assert storage == "local-lvm"
+
+
+def test_find_default_image_storage_raises_when_none_found():
+    mixin = ProxmoxVMProvisionMixin()
+    mixin._api = MagicMock()
+    mixin._api.storage.get.return_value = [
+        {"storage": "local", "type": "dir", "content": "backup,iso,vztmpl"},
+    ]
+
+    with pytest.raises(ValueError, match="images"):
+        mixin._find_default_image_storage()
+
+
+def test_create_vm_from_cloud_init_with_real_world_storage_shape():
+    """Regression: real Proxmox servers omit "enabled" for never-toggled storages
+    (observed live: local-lvm/local-zfs/fast-zfs all had content=images but no
+    "enabled" key at all) — this used to make create_vm_from_cloud_init fail
+    with "No storage with content='images' found" even though usable storage
+    existed."""
+    mixin = ProxmoxVMProvisionMixin()
+    mixin._node_name = "pve1"
+
+    mock_api = MagicMock()
+    mock_api.cluster.nextid.get.return_value = 104
+    mock_api.storage.get.return_value = [
+        {"storage": "local-lvm", "type": "lvmthin", "content": "images,rootdir"},
+        {"storage": "local-zfs", "type": "zfspool", "content": "rootdir,images"},
+        {"storage": "local", "type": "dir", "content": "backup,iso,vztmpl"},
+        {"storage": "snippets", "type": "dir", "content": "snippets"},
+    ]
+
+    mock_node = MagicMock()
+    mixin._api = mock_api
+    mixin._node_api = MagicMock(return_value=mock_node)
+    mixin._download_cloud_image = MagicMock(return_value="/var/lib/vz/template/netork-images/debian-12.qcow2")
+    mixin._run_node_command = MagicMock(return_value="")
+
+    mock_vm = MagicMock()
+    mock_node.qemu.return_value = mock_vm
+    mock_node.qemu.post.return_value = None
+    mock_vm.config.post.return_value = None
+    mock_vm.config.get.return_value = {
+        "unused0": "local-lvm:vm-104-disk-0",
+        "scsi0": "local-lvm:vm-104-disk-0",
+    }
+    mock_vm.status.start.post.return_value = "UPID:pve1:130:start"
+
+    mock_task = MagicMock()
+    mock_task.status.get.return_value = {"status": "stopped", "exitstatus": "OK"}
+    mock_node.tasks.return_value = mock_task
+
+    mock_storage = MagicMock()
+    mock_storage.upload.post.return_value = {"filename": "snippets:snippets/104-user-data.yaml"}
+    mock_node.storage.return_value = mock_storage
+
+    with patch("time.sleep"):
+        result = mixin.create_vm_from_cloud_init(
+            name="real-shape-vm",
+            image_url="https://cloud.debian.org/images/cloud/bookworm/latest/debian-12-genericcloud-amd64.qcow2",
+            cpu=2,
+            memory=2048,
+            nics=[{"bridge": "vmbr0"}],
+            cloud_init_config={"hostname": "real-shape-vm"},
+        )
+
+    assert result["vmid"] == "104"