Initial commit: Shelem card game

Full-stack multiplayer Shelem (Iranian trick-taking card game) with
Socket.IO, JWT auth, bot players, joker mode, and mobile-friendly UI.

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

public/manifest.json

@@ -0,0 +1,14 @@
+{
+  "name": "Shelem",
+  "short_name": "Shelem",
+  "description": "The Persian trick-taking partnership card game",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#133025",
+  "theme_color": "#1a3a1a",
+  "icons": [
+    { "src": "/icons/icon-192.png", "sizes": "192x192", "type": "image/png" },
+    { "src": "/icons/icon-512.png", "sizes": "512x512", "type": "image/png" },
+    { "src": "/icons/icon.svg",     "sizes": "any",     "type": "image/svg+xml" }
+  ]
+}