feat: establish unified project foundation with root config cleanup

- Archive legacy packages/, services/, server/ directories
- Update pnpm workspace to web + browser-ext
- Simplify root package.json scripts to delegate to web/
- Update turbo.json for new workspace structure
- Remove obsolete root config files (vite, tsconfig, etc.)
- Add .nvmrc, .editorconfig for consistent dev environment
- Update CI workflow to remove references to deleted packages
- Add missing dependencies (@tailwindcss/vite, tailwindcss) to web
- Add test and lint scripts to web package
- Verify pnpm install, build, and dev work correctly

vitest.config.ts

@@ -1,21 +0,0 @@
-import { defineConfig } from 'vitest/config';
-
-export default defineConfig({
-  test: {
-    globals: true,
-    environment: 'node',
-    deps: {
-      interopDefault: true,
-    },
-    env: {
-      HIYA_API_KEY: 'test-api-key',
-      HIYA_API_URL: 'https://api.hiya.com/v1',
-    },
-  },
-  optimizeDeps: {
-    include: ['ws'],
-  },
-  ssr: {
-    noExternal: ['ws'],
-  },
-});