feat(web): scaffold SvelteKit SPA with Tailwind + adapter-static

- SvelteKit 2.x + Svelte 5 + TypeScript + Vite 5
- adapter-static with fallback:'index.html' for SPA deep-link routing
- Tailwind configured with dark-only palette matching spec
- Placeholder landing page at /
- Committed web/build/index.html placeholder (via .gitignore negation) so
  go:embed works before the SvelteKit build has been run

web/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "minstrel-web",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite dev",
+    "build": "vite build",
+    "preview": "vite preview",
+    "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+    "test": "svelte-kit sync && vitest run"
+  },
+  "devDependencies": {
+    "@sveltejs/adapter-static": "^3.0.6",
+    "@sveltejs/kit": "^2.8.0",
+    "@sveltejs/vite-plugin-svelte": "^4.0.0",
+    "autoprefixer": "^10.4.20",
+    "jsdom": "^25.0.1",
+    "postcss": "^8.4.49",
+    "svelte": "^5.1.9",
+    "svelte-check": "^4.0.5",
+    "tailwindcss": "^3.4.14",
+    "tslib": "^2.8.0",
+    "typescript": "^5.6.3",
+    "vite": "^5.4.10",
+    "vitest": "^2.1.4"
+  }
+}