Add asset import/export and local dev server setup

- Configure Vite dev server with localhost binding and public asset proxy
- Add npm scripts for concurrent Laravel/Vite development (dev:local, dev:test)
- Implement asset import/export in ACP via ZIP file upload/download
- Create AssetController for asset management endpoints
- Add asset management UI tab in admin panel

resources/js/api/client.js

@@ -536,3 +536,45 @@ export async function createPost({ body, threadId }) {
         }),
     })
 }
+
+export async function exportAssets() {
+    const token = localStorage.getItem('speedbb_token')
+    const headers = {
+        Accept: 'application/json',
+    }
+    if (token) {
+        headers.Authorization = `Bearer ${token}`
+    }
+    const response = await fetch(`${API_BASE}/assets/export`, {
+        headers,
+    })
+    if (response.status === 401) {
+        localStorage.removeItem('speedbb_token')
+        localStorage.removeItem('speedbb_email')
+        localStorage.removeItem('speedbb_user_id')
+        localStorage.removeItem('speedbb_roles')
+        window.dispatchEvent(new Event('speedbb-unauthorized'))
+        throw new Error('Unauthorized')
+    }
+    if (!response.ok) {
+        throw new Error(response.statusText)
+    }
+    const blob = await response.blob()
+    const url = window.URL.createObjectURL(blob)
+    const a = document.createElement('a')
+    a.href = url
+    a.download = `assets-${new Date().toISOString().slice(0, 10)}.zip`
+    document.body.appendChild(a)
+    a.click()
+    window.URL.revokeObjectURL(url)
+    document.body.removeChild(a)
+}
+
+export async function importAssets(file) {
+    const formData = new FormData()
+    formData.append('file', file)
+    return apiFetch('/assets/import', {
+        method: 'POST',
+        body: formData,
+    })
+}