feat: added image dir support for nuxt layer

[wuiyang]

🔗 Linked issue

resolves #1879

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

For Nuxt project that uses IPX provider, it would not search nuxt layer's custom dir.

This changes allows Nuxt project with local layers to look for image in layer's dir.

Note: with this changes, similar to root nuxt config with custom dir, would not work for runtime IPX, and only works for ipxStatic provider.

Note 2: As nuxt.options compiles all layer's config, if root is using default config (not providing any), it will have layer's dir value. The image dir config will retrieve from layer's config instead to prevent this issue.

-    const path = isRootLayer ? moduleOptions.dir : layer.config.dir?.public || 'public'
+    const path = layer?.config.image?.dir || layer.config.dir?.public || 'public'

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[pkg-pr-new]

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npm i https://pkg.pr.new/@nuxt/image@1880

commit: 69e01a3