chore: migrate to pnpm workspaces monorepo with Turborepo

- Restructure directories: apps/api, apps/admin, apps/website
- Add root pnpm-workspace.yaml, turbo.json, .prettierrc, .gitignore
- Rename packages to @inkreach/api, @inkreach/admin, @inkreach/website
- Add shared packages: packages/tsconfig, packages/shared-types
- Add pnpm.onlyBuiltDependencies for native builds
- Update docs: README.md, structs.md
- All three projects build successfully

package.json

@@ -0,0 +1,34 @@
+{
+  "name": "inkreach-official",
+  "private": true,
+  "scripts": {
+    "dev": "turbo run dev",
+    "build": "turbo run build",
+    "lint": "turbo run lint",
+    "format": "prettier --write \"**/*.{ts,js,json,md,vue}\"",
+    "type-check": "turbo run type-check",
+    "prisma:generate": "pnpm --filter @inkreach/api prisma:generate",
+    "prisma:migrate": "pnpm --filter @inkreach/api prisma:migrate",
+    "prisma:studio": "pnpm --filter @inkreach/api prisma:studio"
+  },
+  "devDependencies": {
+    "prettier": "^3.3.0",
+    "turbo": "^2.0.0"
+  },
+  "packageManager": "pnpm@10.33.2",
+  "engines": {
+    "node": ">=20.0.0"
+  },
+  "pnpm": {
+    "onlyBuiltDependencies": [
+      "@nestjs/core",
+      "@parcel/watcher",
+      "@prisma/client",
+      "@prisma/engines",
+      "bcrypt",
+      "esbuild",
+      "prisma",
+      "vue-demi"
+    ]
+  }
+}