feat: migrate frontend React 18 → Svelte 5 + SvelteKit

Core logic portable (economy, balance, cosmetics, migrateSave) — zero rewrite.
136 tests green, identiques. Backend inchangé.

- Svelte 5 runes stores (game, auth, toast) remplacent Zustand
- SvelteKit adapter-static SPA (dist/ output, fallback index.html)
- Tailwind v4 conservé, design system .gp-* porté
- Transitions natives : slide, fly, scale, fade sur toute l'UI
- Sidebar tabbée (Production/Evolution/Collection) + CollapsiblePanel
- Mobile bottom sheet avec FAB toggle + backdrop blur
- Click particles réactifs Svelte (plus de DOM impératif)
- TadpoleSprite bounce + glow ring au clic
- Guide refait en accordéon, Achievements avec filtres
- a11y : focus-visible, Escape modals, aria-current, aria-labels
- CI/CD adapté (tests + build + rsync)
- Build 504K (vs ~1.2MB React)

deploy/deploy.sh

@@ -9,29 +9,24 @@ echo "=== Clickerz deploy ==="
 # 1. Pull latest
 git pull --ff-only
 
-# 2. Build frontend
-echo "--- Building frontend..."
+# 2. Build frontend (Svelte 5 + SvelteKit)
+echo "--- Building frontend (Svelte)..."
 cd Frontend
-npm ci --production=false
+npm ci
+npx vitest run
 npm run build
-echo "--- Copying dist to /var/www/clickerz..."
-sudo rm -rf /var/www/clickerz
-sudo cp -r dist /var/www/clickerz
+echo "--- Copying dist to /var/www/clickerz/frontend/dist..."
+mkdir -p /var/www/clickerz/frontend/dist
+rsync -a --delete dist/ /var/www/clickerz/frontend/dist/
 cd ..
 
 # 3. Backend deps
 echo "--- Installing backend deps..."
 cd Backend
-npm ci --production
+npm ci --omit=dev
 cd ..
 
-# 4. Run migrations
-echo "--- Running DB migrations..."
-cd Backend
-npm run db:migrate
-cd ..
-
-# 5. Restart pm2
+# 4. Restart pm2
 echo "--- Restarting pm2..."
 pm2 startOrRestart ecosystem.config.cjs --env production
 pm2 save