fix(core): define Vue feature flags for non-Vue hosts

[webfansplz]

Fix #513

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@vitejs/devtools

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@vitejs/devtools-kit

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@vitejs/devtools-oxc

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@vitejs/devtools-rolldown

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@vitejs/devtools-vite

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@vitejs/devtools-vitest

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commit: 513287a

[Copilot]

Pull request overview

This PR addresses #513 by ensuring Vue ESM-bundler feature flags are explicitly defined by the DevTools injection plugin when running in non-Vue hosts, preventing the browser console warning about missing __VUE_* compile-time flags.

Changes:

• Add a config() hook to DevToolsInjection that provides default values for Vue feature flags when not already defined by the host.
• Add Vitest coverage validating the default flag definitions and host-defined overrides.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
packages/core/src/node/plugins/injection.ts	Injects default define values for Vue feature flags during serve to suppress Vue’s missing-feature-flags warning.
packages/core/src/node/plugins/tests/injection.test.ts	Adds tests validating default Vue flag definitions and preserving host-provided flag values.

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