fix: preserve list markers on named slice types

[Harsh-128]

What happened

List markers on named slice types were not being picked up when the type was used as a struct field.

For example, when a field uses a named slice type:

type NamedItemList []string

with markers such as:

// +listType=map
// +listMapKey=port

the generated OpenAPI schema did not include the corresponding list extensions.

What changed

The generator now also checks the comments on the alias type when generating member extensions.

A regression test was added to TestExtensions covering a named slice type with +listType=map and +listMapKey=port.

Testing

• go test ./pkg/generators -run TestExtensions -count=1
• go test ./pkg/generators/...
• git diff --check

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Harsh-128 / name: Harsh-128 (1043415)

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