feat: add lighthouse manual check

[kstala]

Adding lighthouse check, run only manually, without uploading reports to the lighthouse server

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ToDo's

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[vercel]

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Name	Status	Preview	Updated (UTC)
frontends-demo	✅ Ready (Inspect)	Visit Preview	Jan 17, 2025 9:35am
shopware-frontends-docs	✅ Ready (Inspect)	Visit Preview	Jan 17, 2025 9:35am

[pkg-pr-new]

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@shopware/api-client

npm i https://pkg.pr.new/shopware/frontends/@shopware/api-client@1607

@shopware/api-gen

npm i https://pkg.pr.new/shopware/frontends/@shopware/api-gen@1607

@shopware/cms-base-layer

npm i https://pkg.pr.new/shopware/frontends/@shopware/cms-base-layer@1607

@shopware/composables

npm i https://pkg.pr.new/shopware/frontends/@shopware/composables@1607

@shopware/helpers

npm i https://pkg.pr.new/shopware/frontends/@shopware/helpers@1607

@shopware/nuxt-module

npm i https://pkg.pr.new/shopware/frontends/@shopware/nuxt-module@1607

commit: f15d350