feat(sprint1-step6): polish, landing page, responsive, deploy config

- Landing.jsx : écran d'accueil "Entrer dans le Marais" sur /
- Home.jsx : jeu sur /jeu, click animation float-up, sidebar responsive
- formatNumber.ts : util partagé k/M/B/T (remplace 4 copies locales)
- home.scss : rewrite classes (game-cover, click-zone, tadpole-sprite, game-sidebar)
- Responsive : sidebar fixe desktop, drawer bottom mobile (<768px)
- navbar : wildCoin → resource-counter, auth-nav stylé, dead code supprimé
- GameSync.tsx : bridge useSaveSync ↔ Zustand (câblé dans App)
- tadpole.svg : asset renommé (SantaClause-bag → tadpole)
- deploy/ : Apache vhost SPA+proxy, deploy.sh, ecosystem.config.cjs PM2
- NavBarData : Jeu → /jeu
- Cleanup : dead imports, commentaires legacy

Frontend/src/App.jsx

@@ -4,6 +4,8 @@ import { Outlet } from "react-router-dom";
 import Navbar from "./components/navbar";
 import Footer from "./components/footer";
 import Hud from "./components/Hud/Hud";
+import { GameTick } from "./components/GameTick";
+import { GameSync } from "./components/GameSync";
 
 import "./scss/root.scss";
 import "./scss/components/footer.scss";
@@ -12,20 +14,22 @@ import navData from "./data/NavBarData.json";
 
 function App() {
   const [isVisible, setIsVisible] = useState(false);
-  const [toggleSnow, setToggleSnow] = useState(false);
+  const [toggleRain, setToggleRain] = useState(false);
 
   return (
     <>
+      <GameTick />
+      <GameSync />
       <Navbar
         navData={navData}
         isVisible={isVisible}
         setIsVisible={setIsVisible}
-        toggleSnow={toggleSnow}
-        setToggleSnow={setToggleSnow}
+        toggleRain={toggleRain}
+        setToggleRain={setToggleRain}
       />
       <Hud isVisible={isVisible} setIsVisible={setIsVisible} />
       <main>
-        <Outlet context={[toggleSnow, setToggleSnow]} />
+        <Outlet context={[toggleRain, setToggleRain]} />
       </main>
       <Footer />
     </>