feat(astrolabe): upgrade to Vue 3 and @nextcloud/vue 9

- Merge renovate/major-vue-monorepo: Vue 2.7.16 → 3.5.26
- Merge renovate/nextcloud-vue-9.x: @nextcloud/vue 8.29.2 → 9.3.1
- Update component imports to new @nextcloud/vue v9 paths
- Replace .sync modifiers with v-model:prop (Vue 3 syntax)
- Replace beforeDestroy with beforeUnmount lifecycle hook
- Remove Vue.() usage (automatic reactivity in Vue 3)
- Update main.js to use createApp() instead of Vue.extend()
- Add @vitejs/plugin-vue and configure Vite for Vue 3
- All builds passing, ready for admin UX improvements

third_party/astrolabe/vite.config.js

@@ -1,7 +1,25 @@
-import { createAppConfig } from '@nextcloud/vite-config'
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+import { resolve } from 'path'
 
-export default createAppConfig({
-  main: 'src/main.js',
-  adminSettings: 'src/adminSettings.js',
-  personalSettings: 'src/personalSettings.js',
+export default defineConfig({
+  plugins: [vue()],
+  build: {
+    outDir: 'js',
+    emptyOutDir: false,
+    rollupOptions: {
+      input: {
+        main: resolve(__dirname, 'src/main.js'),
+        'astrolabe-adminSettings': resolve(__dirname, 'src/adminSettings.js'),
+        'astrolabe-personalSettings': resolve(__dirname, 'src/personalSettings.js'),
+      },
+      output: {
+        entryFileNames: '[name].mjs',
+        chunkFileNames: '[name]-[hash].chunk.mjs',
+        assetFileNames: '[name][extname]',
+      },
+    },
+    sourcemap: true,
+    minify: 'terser',
+  },
 })