Potential fix for code scanning alert no. 3: Replacement of a substring with itself

[zeti1223]

Potential fix for https://github.com/cigoria/simpleShare/security/code-scanning/3

In general, a “replacement of a substring with itself” warning means either the replacement is pointless and should be removed, or there is a typo and the replacement should actually change the string (for example, adding or stripping a prefix). Here, since p.replace(/^\/admin/, '/admin') leaves the path unchanged, the cleanest fix without altering functionality is to remove the rewrite function so that the proxy simply forwards /admin paths as-is.

Concretely, in client/vite.config.js, within the server.proxy['/admin'] block, delete the rewrite property. The result will be:

'/admin': {
  target: backend,
  changeOrigin: true
}

No new imports or helper methods are needed; we are only simplifying the existing object literal.

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