fix(dev): keep lazy handlers code-split in dev

[jibin7jose]

Linked issue

Fixes #4435

Type of change

• Documentation (updates to the documentation, readme, or JSdoc annotations)
• Bug fix (a non-breaking change that fixes an issue)
• Enhancement (improving an existing functionality like performance)
• 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

This fixes a bug in the nitro-dev preset where an import-time error in a single lazy route handler takes down the entire dev server and breaks unrelated routes with a misleading Cannot access '<x>' before initialization error.

Cause:
The nitro-dev preset was setting inlineDynamicImports: true. This caused Rollup to inline all lazy handler bodies into the single index.mjs startup bundle. An error evaluating one route would abort the execution of the bundle, leaving subsequent routes permanently in the Temporal Dead Zone (TDZ).

Fix:
Set inlineDynamicImports: false in the nitro-dev preset. This ensures lazy handlers remain code-split during local development, so an import-time failure in one module will not disrupt the evaluation of the rest of the server or other routes. When a broken route is accessed, the dev server will now accurately report the original initialization error.

(Note: This PR is functionally equivalent to #4436 and #4458, but properly targets the v2 branch where this issue actually affects users.)

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