feat: add footer with app version

vite.config.ts

@@ -1,16 +1,28 @@
 import { fileURLToPath, URL } from "node:url";
+import { execSync } from "node:child_process";
 
 import { defineConfig } from "vite";
 import vue from "@vitejs/plugin-vue";
 import vueJsx from "@vitejs/plugin-vue-jsx";
 import svgLoader from "vite-svg-loader";
 
+function getGitCommitHash(): string {
+  try {
+    return execSync("git rev-parse --short HEAD").toString().trim();
+  } catch (error) {
+    return "unknown";
+  }
+}
+
 // https://vitejs.dev/config/
 export default defineConfig({
   base: "./",
   build: {
     target: "esnext",
   },
+  define: {
+    __APP_VERSION__: JSON.stringify(getGitCommitHash()),
+  },
   optimizeDeps: {
     esbuildOptions: {
       target: "esnext",