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.

packages/shared/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "@kvarta/shared",
+  "private": true,
+  "type": "module",
+  "exports": {
+    "./phone": "./src/phone.ts",
+    "./lead": "./src/lead.ts"
+  },
+  "scripts": {
+    "typecheck": "tsc -p ."
+  }
+}