Replace webpack build in fdc3-conformance with vite

[pranitaurlam]

Summary

Resolves #1830

• Replaced webpack.config.js with vite.config.ts in toolbox/fdc3-conformance
• Uses vite with multiple TypeScript entry points (ES module output) matching the pattern used by other packages (fdc3-workbench, fdc3-for-web/reference-ui)
• vite-plugin-node-polyfills replaces webpack's ProvidePlugin + manual resolve.fallback polyfills
• vite-plugin-css-injected-by-js replaces webpack's style-loader for CSS injection
• Removed runtime polyfill deps (buffer, process, stream-browserify, util, window) since vite-plugin-node-polyfills handles these at build time
• Converted require() calls to ES import statements in src/test/index.ts
• Updated all static HTML app pages to use <script type="module"> for ES module output
• Removed the redundant sourceMapSupport.install() inline script from app/index.html (timing issue with deferred modules; source map support is set up by the imported module)

Test plan

• npm run build in toolbox/fdc3-conformance completes successfully with vite
• npm run dev starts the conformance test server on port 3001
• Conformance tests run and complete successfully against the FDC3 reference implementation (toolbox/fdc3-for-web/demo)
• All mock apps load correctly (basic, channels, general, metadata, open-a, intent-a through intent-k)

🤖 Generated with Claude Code

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[linux-foundation-easycla]

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[kriswest]

@pranitaurlam could you have a look at the conflicts please.

Also please note that you will need to add an entry in CHANGELOG.md