Implement asset upload API and utility functions

- Add Asset and CardLayer model updates
- Create asset upload API endpoints
- Add AssetUploadDialog component
- Create card layout algorithms
- Implement symmetry generation utils
- Add template configurations

frontend/src/api/asset.js

@@ -0,0 +1,26 @@
+import axios from 'axios'
+
+const API_BASE = '/api'
+
+export async function getAssets(projectId) {
+  const response = await axios.get(`${API_BASE}/projects/${projectId}/assets/`)
+  return response.data
+}
+
+export async function uploadAsset(projectId, file, assetType, assetKey) {
+  const formData = new FormData()
+  formData.append('file', file)
+  formData.append('asset_type', assetType)
+  formData.append('asset_key', assetKey)
+
+  const response = await axios.post(`${API_BASE}/projects/${projectId}/assets/`, formData, {
+    headers: {
+      'Content-Type': 'multipart/form-data'
+    }
+  })
+  return response.data
+}
+
+export async function deleteAsset(projectId, assetId) {
+  await axios.delete(`${API_BASE}/projects/${projectId}/assets/${assetId}/`)
+}