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>

src/main.ts

@@ -0,0 +1,22 @@
+// Latin subset only — this content is Latin/English, no need to ship
+// cyrillic/greek glyph data into the offline precache.
+import '@fontsource/eb-garamond/latin-400.css';
+import '@fontsource/eb-garamond/latin-600.css';
+import '@fontsource/source-serif-4/latin-400.css';
+import '@fontsource/source-serif-4/latin-400-italic.css';
+import '@fontsource/inter/latin-400.css';
+import '@fontsource/inter/latin-600.css';
+import './ui/styles.css';
+import { registerSW } from 'virtual:pwa-register';
+import { initRouter } from './router';
+import { mountShell } from './ui/shell';
+
+const root = document.getElementById('app');
+if (!root) {
+  throw new Error('missing #app root element');
+}
+
+initRouter();
+mountShell(root);
+
+registerSW({ immediate: true });