feat: migration complète 11ty → SvelteKit (v3)

- SvelteKit 2 + Svelte 5 runes + TS, adapter-static, paths.base '/gwada-sirius' (relative: false)
- 5 pages × 3 locales (/, /en/, /ht/) : catalogues inlang repris tels quels, routeur i18n maison avec fallback ht→fr
- Îlots → composants natifs avec fallback SSR (calculateur, carte Leaflet, globe) ; Leaflet en import dynamique
- Dette corrigée : aria-current (bug legacy), polices en double, SEO complet (Seo, hreflang ×3, OG, Twitter, robots, sitemap 15 URLs)
- PWA : manifest + service-worker v3 (stale-while-revalidate)
- CI GitHub Pages mise à jour (build/), README et NOTES_PROJET réécrits
- Lighthouse mobile : 98/95/100/100 — svelte-check 0/0, Leaflet vérifié (2 cartes, tuiles OSM), no-JS vérifié

package.json

@@ -1,26 +1,26 @@
 {
-  "name": "gwada-sirius",
-  "version": "2.0.0",
-  "type": "module",
-  "scripts": {
-    "messages": "paraglide-js compile --project ./project.inlang --outdir ./src/paraglide",
-    "dev": "npm run messages && eleventy --serve",
-    "build": "npm run messages && eleventy",
-    "preview": "npx serve _site",
-    "deploy": "npm run build && gh-pages -d _site"
-  },
-  "devDependencies": {
-    "@11ty/eleventy": "^3.1.6",
-    "@11ty/eleventy-plugin-vite": "^8.0.0",
-    "@fontsource-variable/fraunces": "^5.2.9",
-    "@fontsource/atkinson-hyperlegible": "^5.2.8",
-    "@inlang/paraglide-js": "^2.20.2",
-    "@sveltejs/vite-plugin-svelte": "^7.1.4",
-    "gh-pages": "^6.1.1",
-    "svelte": "^5.56.4",
-    "vite": "^8.1.3"
-  },
-  "dependencies": {
-    "leaflet": "^1.9.4"
-  }
+	"name": "gwada-sirius",
+	"version": "3.0.0",
+	"private": true,
+	"type": "module",
+	"scripts": {
+		"dev": "vite dev",
+		"build": "vite build",
+		"preview": "vite preview",
+		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch"
+	},
+	"devDependencies": {
+		"@sveltejs/adapter-static": "^3.0.10",
+		"@sveltejs/kit": "^2.70.1",
+		"@sveltejs/vite-plugin-svelte": "^7.2.0",
+		"@types/leaflet": "^1.9.21",
+		"svelte": "^5.56.7",
+		"svelte-check": "^4.7.3",
+		"typescript": "^6.0.3",
+		"vite": "^8.1.5"
+	},
+	"dependencies": {
+		"leaflet": "^1.9.4"
+	}
 }