[Enh]: For auto-config entities support `views`

## What?

Support views as well as tables in autoentities.

> [!NOTE]
> This feature supports only read-only views.

## Why?

Because many customers, especial with MCP, prefer views.

## How?

This is tricky because views do not have keys, which we currently require. The only viable solution without adding significant complexity is to include views as read-only entities. However, we currently don't have this concept. But it is coming!

* #2791

This prerequisite task introduces read-only views and enables this feature.

### Configuration

```json
{
"autoentities": {
"default": {
"source-type": [ "view" ] // default: [ table ]
}
}
}
```

> An autoentity can include more than one type.

### Command line

```
dab auto-config --source-type "table,view"
```

まず、issue で説明されている autoentities の設定と `dab auto-config` コマンドから始め、次に読み取り専用ビューについての前提 issue #2791 を読んでください。autoentities が `view` を含む `source-type` の値を受け付け、コマンドが読み取り専用ビュー向けに `--source-type "table,view"` をサポートすれば、作業は完了です。

索引モデルが issue の本文から書いたものです。