Namespace-prefixed sequences aren't supported

When users define sequences that include the namespace, e.g.

```yaml

sequences:
my-sequence:
actions: >-
namespace/auth,
namespace/real-action
```

They get an error:

```shell
› Sequence component 'namespace/real-action' does not exist (sequence =
› 'my-sequence')
```

This is because in the plugin, we track the action in the sequence as `namespace/auth` for example

But the list of actions we get from the config library tracks actions only in name, e.g. `auth`

Namespace-prefixed actions in a sequence are a valid Runtime use case that we should look into supporting

首先跟踪 plugin 如何解析序列操作，并将其与 config library 返回的操作名称进行比较。复现 issue 中带 namespace 前缀的序列，然后验证 `namespace/auth` 和 `namespace/real-action` 能够成功解析，同时不带前缀的序列仍可正常工作。

由索引模型根据 Issue 内容生成。