chore: upgrade pnpm to v11 and refresh dependencies (#185)

Migrate overrides to pnpm-workspace.yaml for pnpm 11 compatibility and update transitive deps (Vue, Vite, Rollup).

package.json

@@ -2,7 +2,7 @@
   "name": "source-code-hunter",
   "version": "1.0.0",
   "private": true,
-  "packageManager": "pnpm@9.15.0",
+  "packageManager": "pnpm@11.9.0",
   "scripts": {
     "docs:dev": "vitepress dev docs",
     "docs:build": "vitepress build docs",
@@ -13,13 +13,5 @@
   },
   "devDependencies": {
     "vitepress": "2.0.0-alpha.17"
-  },
-  "pnpm": {
-    "overrides": {
-      "mdast-util-to-hast": "13.2.1",
-      "picomatch": "4.0.4",
-      "postcss": "8.5.15",
-      "rollup": "4.61.1"
-    }
   }
 }

pnpm-workspace.yaml

@@ -0,0 +1,11 @@
+packages:
+  - .
+
+allowBuilds:
+  esbuild: true
+
+overrides:
+  mdast-util-to-hast: 13.2.1
+  picomatch: 4.0.4
+  postcss: 8.5.15
+  rollup: 4.62.2