feat: enable nuxtLayers functionality in uno config

[mkucmus]

Description

closes: #1876

Type of change

-- New feature (non-breaking change which adds functionality)

ToDo's

• docs
• changeset

Screenshots (if applicable)

Additional context

[vercel]

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Name	Status	Preview	Updated (UTC)
frontends-demo	🔄 Building (Inspect)	Visit Preview	Jun 30, 2025 0:22am

1 Skipped Deployment

Name	Status	Preview	Updated (UTC)
shopware-frontends-docs	⬜️ Skipped (Inspect)		Jun 30, 2025 0:22am

[pkg-pr-new]

Open in StackBlitz

@shopware/api-client

npm i https://pkg.pr.new/shopware/frontends/@shopware/api-client@1907

@shopware/api-gen

npm i https://pkg.pr.new/shopware/frontends/@shopware/api-gen@1907

@shopware/cms-base-layer

npm i https://pkg.pr.new/shopware/frontends/@shopware/cms-base-layer@1907

@shopware/composables

npm i https://pkg.pr.new/shopware/frontends/@shopware/composables@1907

@shopware/helpers

npm i https://pkg.pr.new/shopware/frontends/@shopware/helpers@1907

@shopware/nuxt-module

npm i https://pkg.pr.new/shopware/frontends/@shopware/nuxt-module@1907

commit: d1179f7