Add full SkinsPins application

- FastAPI + SQLite + Alpine.js + HTMX PWA for Bingo Bango Bongo golf scoring
- Passwordless magic link auth with email (aiosmtplib) and admin invite system
- Real-time score entry via WebSocket with drag-and-drop player ordering
- Course management with per-hole par and stroke index
- Scorecard with golf score markers (birdie, eagle, bogey, etc.)
- Two-step new game form with tee selection per player
- Dashboard with stats, live games social stream, and recent game history
- Game summary view (read-only scorecard with leaderboard)
- User profile pages with win stats
- PWA install support with generated PNG icons
- Admin panel for users, courses, games, and invitations

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

static/sw.js

@@ -0,0 +1,27 @@
+const CACHE = "skinspins-v1";
+const PRECACHE = ["/static/style.css", "/static/manifest.json"];
+
+self.addEventListener("install", (e) => {
+  e.waitUntil(caches.open(CACHE).then((c) => c.addAll(PRECACHE)));
+  self.skipWaiting();
+});
+
+self.addEventListener("activate", (e) => {
+  e.waitUntil(
+    caches.keys().then((keys) =>
+      Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k)))
+    )
+  );
+  self.clients.claim();
+});
+
+self.addEventListener("fetch", (e) => {
+  // Network-first for navigation; cache-first for static assets
+  if (e.request.mode === "navigate") {
+    e.respondWith(fetch(e.request).catch(() => caches.match(e.request)));
+  } else {
+    e.respondWith(
+      caches.match(e.request).then((cached) => cached || fetch(e.request))
+    );
+  }
+});