Milestone 0/1: shell, calendar/psalter/hours scaffold, Prime

Client-side-first PWA (Vite/TS, no backend) per the approved plan: day-
navigable shell listing all 8 hours, Prime fully resolves via the
calendar -> psalter -> ordo pipeline, the other 7 hours are registered
but flagged not-implemented. Sanctoral/temporal calendar data uses a
day -> id indirection layer (saints, easter-offsets, fixed-date-calendar)
so reassigning a feast to a different day is a data edit, not a code
change. Docker (Caddy-serving-static) + Gitea CI workflow scaffolded to
match the eec/drip/bookshop operational pattern.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

vite.config.ts

@@ -0,0 +1,43 @@
+/// <reference types="vitest/config" />
+import { defineConfig } from 'vite';
+import { VitePWA } from 'vite-plugin-pwa';
+import yaml from '@rollup/plugin-yaml';
+
+// Served under reground.org/vu (Caddy path_mount to the vu container) — every
+// asset URL and the service worker's registration scope must be scoped to
+// this path, or they'll resolve against the domain root instead.
+const base = '/vu/';
+
+export default defineConfig({
+  base,
+  plugins: [
+    yaml(),
+    VitePWA({
+      registerType: 'autoUpdate',
+      scope: base,
+      base,
+      manifest: {
+        name: 'vu',
+        short_name: 'vu',
+        start_url: base,
+        scope: base,
+        display: 'standalone',
+        background_color: '#f7f3ea',
+        theme_color: '#7a2e2e',
+        icons: [
+          { src: 'icons/icon-192.png', sizes: '192x192', type: 'image/png' },
+          { src: 'icons/icon-512.png', sizes: '512x512', type: 'image/png' },
+        ],
+      },
+      workbox: {
+        // Precache everything the shell needs so a day's office renders
+        // fully offline once visited once.
+        globPatterns: ['**/*.{js,css,html,ico,png,svg,woff2}'],
+      },
+    }),
+  ],
+  test: {
+    environment: 'jsdom',
+    globals: false,
+  },
+});