fix: replace require() with dynamic import() in vite config for ESM compatibility

[Viou]

Problem

When using config.bundler = 'vite' in a project installed from npm, the build and dev server fail immediately:

Error [ERR_REQUIRE_ESM]: require() of ES Module .../vite-tsconfig-paths/dist/index.js
from .../node_modules/@availity/workflow/vite.config.js not supported.

Root cause

vite.config.js uses createRequire() to load 6 packages that are all ESM-only:

• vite-tsconfig-paths
• vite-plugin-static-copy
• vite-plugin-checker
• @vitejs/plugin-react-swc / @vitejs/plugin-react
• @availity/workflow-logger (switched from CJS to ESM in v8.0.0)

This wasn't caught in the monorepo because workspace:* resolution handles the CJS/ESM boundary transparently.
The bug only manifests when consuming the published packages from npm.

Fix

• Make buildViteConfig async, replace all require() with await import()
• Make buildViteProductionConfig async, await the base config
• Add await to callers in build.js and start.js (both already async)
• Add regression tests that import and call the real vite configs

Testing

Added 2 tests to workflowConfigs.spec.js that call buildViteConfig(settings) and
buildViteProductionConfig(settings) without mocking the plugin imports. Verified tests fail without the fix and
pass with it.