feat: scaffold PulseNode dashboard (M1)

Next.js 16 + TypeScript + Tailwind v4 app with a YAML-driven config
system: schema validation (zod), .env interpolation, and a widget
registry rendering bookmark/search/group widgets. CSS custom
properties (--pn-*) drive theming and are overridable from
config.yml's theme.variables. Config load errors surface as a
readable error page instead of crashing the app.

Hot reload, docker/system/http collectors, and the WebSocket push
layer land in later milestones per the approved plan.

package.json

@@ -0,0 +1,38 @@
+{
+  "name": "pulsenode",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "eslint"
+  },
+  "dependencies": {
+    "chokidar": "^5.0.0",
+    "dockerode": "^5.0.1",
+    "dotenv": "^17.4.2",
+    "next": "16.3.1",
+    "p-limit": "^7.3.1",
+    "react": "19.2.8",
+    "react-dom": "19.2.8",
+    "systeminformation": "^5.33.1",
+    "ws": "^8.21.3",
+    "yaml": "^2.9.0",
+    "zod": "^4.4.3"
+  },
+  "devDependencies": {
+    "@tailwindcss/postcss": "^4",
+    "@types/dockerode": "^4.0.1",
+    "@types/node": "^20",
+    "@types/react": "^19",
+    "@types/react-dom": "^19",
+    "@types/ws": "^8.18.1",
+    "eslint": "^9",
+    "eslint-config-next": "16.3.1",
+    "tailwindcss": "^4",
+    "tsx": "^4.23.12",
+    "typescript": "^5"
+  },
+  "packageManager": "pnpm@11.21.0"
+}