chore: remove leftover code

[webfansplz]

Two small leftovers from earlier versions.

• Unused vitePluginClientUrl in the extension's detection payload. The content script read window.__VUE_DEVTOOLS_VITE_PLUGIN_CLIENT_URL__, but nothing sets that global, and nothing reads the field. It dates from the older feature that loaded the Vite plugin's client inside the extension panel (feat: inject vite plugin into devtools panel #27), which v9 doesn't have. Removed it from shared/detection.ts, content/backend.ts, background/tab-state.ts, and the related unit test.
• CommonJS in the Vite plugin build script. packages/vite/package.json copied the client with node --input-type=commonjs and require. It now uses --input-type=module and import, in line with the ESM-only packages.

Verification

• pnpm --filter vite-plugin-vue-devtools build passes. It still removes the old packages/vite/client first, the copy matches packages/client/dist exactly, and a missing source still fails the build.
• pnpm test:smoke:vite passes (7 tests).
• Unit and integration tests pass, and tsc on the Chrome package is clean.

🤖 Generated with Claude Code

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commit: e4679e4