Add PM2 setup to deployment script

Add a start script using vite preview on port 4174 and replace the
static file copy step in deploy.sh with PM2 start/reload logic.

package.json

@@ -10,6 +10,7 @@
     "dev": "vite",
     "build": "run-p type-check \"build-only {@}\" -- && cp public/.htaccess dist/.htaccess",
     "preview": "vite preview",
+    "start": "vite preview --port 4174 --host",
     "build-only": "vite build",
     "type-check": "vue-tsc --build",
     "lint": "eslint . --fix --cache",
@@ -37,4 +38,4 @@
     "vite-plugin-vue-devtools": "^8.0.3",
     "vue-tsc": "^3.1.1"
   }
-}
+}