feat: configure CI/CD with Forgejo Actions

- Add Forgejo workflow for automated build and deploy
- Build creates dist/ from public/ then adds Vue app build
- Configure Vite to build to dist/assets/dist with fixed filenames
- Deploy entire dist/ directory to production via FTP
- Add workflow documentation with FTP setup instructions

The workflow mirrors the GitLab CI approach: dist/ is created during build
and synchronized to production root on every push to main.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

vite.config.js

@@ -4,4 +4,23 @@ import vue from '@vitejs/plugin-vue'
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [vue()],
+  publicDir: false, // Les assets statiques sont gérés par Kirby dans public/
+  build: {
+    outDir: 'dist/assets/dist',
+    emptyOutDir: true,
+    manifest: false,
+    rollupOptions: {
+      output: {
+        entryFileNames: 'index.js',
+        chunkFileNames: '[name].js',
+        assetFileNames: (assetInfo) => {
+          // Le CSS principal doit s'appeler index.css pour correspondre à header.php
+          if (assetInfo.name && assetInfo.name.endsWith('.css')) {
+            return 'index.css'
+          }
+          return '[name].[ext]'
+        }
+      }
+    }
+  }
 })