fix: handle router.base for crawler and serve

[Atinux]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

router.base was not handled properly for the crawler and nuxt serve

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[codecov-commenter]

Codecov Report

Merging #7486 into dev will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev    #7486      +/-   ##
==========================================
- Coverage   70.22%   70.20%   -0.02%     
==========================================
  Files          88       88              
  Lines        3714     3715       +1     
  Branches     1008     1008              
==========================================
  Hits         2608     2608              
- Misses        898      899       +1     
  Partials      208      208              

Flag	Coverage Δ
#unittests	70.20% <0.00%> (-0.02%)	⬇️

Impacted Files	Coverage Δ
packages/cli/src/commands/serve.js	72.41% <ø> (ø)
packages/generator/src/generator.js	85.07% <ø> (ø)
packages/vue-renderer/src/renderers/ssr.js	0.00% <0.00%> (ø)

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