chore: pnpm workspace — landing, api, shared

apps/landing: Next.js 16 (App Router, standalone), Tailwind 4, ESLint
с запретом импорта из api. apps/api: Hono + better-sqlite3, сборка tsup,
/api/health. packages/shared: исходники TS без сборки. Vitest projects.

package.json

@@ -0,0 +1,18 @@
+{
+  "name": "kvarta",
+  "private": true,
+  "packageManager": "pnpm@11.22.0",
+  "engines": { "node": ">=22" },
+  "scripts": {
+    "dev": "pnpm -r --parallel dev",
+    "build": "pnpm -r build",
+    "test": "vitest run",
+    "typecheck": "pnpm -r typecheck",
+    "lint": "pnpm -r lint"
+  },
+  "devDependencies": {
+    "@types/node": "^26.6.5",
+    "typescript": "~6.0.3",
+    "vitest": "^5.0.5"
+  }
+}