feat: Initial commit Plants vs Zombies Web Edition v2.4

- 5 Biomes: Day, Night, Pool, Fog, Roof (25 Campaign levels)
- Minigames: Wall-nut Bowling, I Zombie, Roguelike, Boss Rush & Dr. Zomboss
- Systems: Zen Garden, Workshop Crafting, Almanac, Tree of Wisdom, Achievements
- Backend: REST API + SQLite Accounts & Save Synchronization
- Infrastructure: Nginx HTTPS & Docker deployment

game/manifest.json

@@ -0,0 +1,29 @@
+{
+  "name": "Plants vs. Zombies Web Edition",
+  "short_name": "PvZ Web",
+  "start_url": "./index.html",
+  "display": "standalone",
+  "orientation": "landscape-primary",
+  "background_color": "#1b5e20",
+  "theme_color": "#2e7d32",
+  "description": "Legendary Plants vs Zombies HTML5 web game with Zen Garden, Workshop, Roguelike, Boss Battles, and Leaderboards.",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "32x32",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ]
+}