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feat(service): storage logical search operators (#3727)

## Storage logical search operators

Extends the storage search `condition` to support the logical operators
**`and`**, **`or`**, and **`not`**, so device searches can combine
multiple criteria instead of a single flat match.

Previously a `condition` accepted only a single leaf (`name`, `size`, or
partition `number`). Now those leaves can be freely nested inside
operator nodes, evaluated recursively across the full pipeline: JSON
import/export, model conversions, config solvers, and config/model
checkers. The schema and a full set of examples are updated accordingly.

### Operators

- **`and`** — array of conditions; all must match.
- **`or`** — array of conditions; at least one must match.
- **`not`** — single condition; matches when it does *not*.
- Operators nest arbitrarily and wrap the existing leaves (`name`,
`size`, `number`).

### JSON examples

Match drives larger than 10 GiB, excluding `/dev/vdb`:

```json
{
  "search": {
    "condition": {
      "and": [
        { "size": { "greater": "10 GiB" } },
        { "not": { "name": "/dev/vdb" } }
      ]
    }
  }
}
```

Match either of two drives:

```json
{
  "search": {
    "condition": {
      "or": [
        { "name": "/dev/vda" },
        { "name": "/dev/vdb" }
      ]
    }
  }
}
```

Negate a size condition:

```json
{
  "search": {
    "condition": {
      "not": { "size": { "less": "10 GiB" } }
    }
  }
}
```

Nested operators (one of two drives, and not smaller than 1 GiB):

```json
{
  "search": {
    "condition": {
      "and": [
        { "or": [ { "name": "/dev/vda" }, { "name": "/dev/vdb" } ] },
        { "not": { "size": { "less": "1 GiB" } } }
      ]
    }
  }
}
```

Operators also apply to partition searches (using the `number` leaf):

```json
{
  "search": {
    "condition": {
      "and": [
        { "number": 1 },
        { "size": { "greater": "1 GiB" } }
      ]
    }
  }
}
```

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