web: vite + react + tailwind hello page with dark-mode toggle

Workspace packages export TS source under a 'source' condition used by
vite, node (--conditions=source) and tsc.

Task: M0-T4

apps/web/vite.config.ts

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+import { defaultClientConditions, defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+import tailwindcss from '@tailwindcss/vite';
+
+export default defineConfig({
+  plugins: [react(), tailwindcss()],
+  resolve: { conditions: ['source', ...defaultClientConditions] }, // workspace packages ship TS source
+  server: {
+    proxy: {
+      // Same split as the reverse proxy (01 §5): /ws is Asterisk SIP-over-WebSocket, the rest is the api.
+      '/api': { target: 'http://127.0.0.1:8080', ws: true },
+      '/ws': { target: 'ws://127.0.0.1:8088', ws: true },
+    },
+  },
+});