init: DPDK → DPU learning blog (VitePress)

- VitePress static site for rendering all markdown documents
- Auto-discovers .md files from dpdk-roadmap-v3 and dpdk-study-kb
- Features: full-text search, dark mode, responsive design
- Pages: roadmap, notes (Phase 0-3), product docs, knowledge base

package.json

@@ -0,0 +1,17 @@
+{
+  "name": "blog-site",
+  "version": "1.0.0",
+  "description": "DPDK → DPU Learning Blog — powered by VitePress",
+  "type": "module",
+  "scripts": {
+    "dev": "vitepress dev",
+    "build": "vitepress build",
+    "preview": "vitepress preview"
+  },
+  "keywords": ["dpdk", "dpu", "network", "learning", "blog"],
+  "author": "wxj",
+  "license": "MIT",
+  "devDependencies": {
+    "vitepress": "^1.6.4"
+  }
+}