Support garage v1 (#31)

* feat: support garage v1

frontend/src/lib/api.ts

@@ -8,6 +8,7 @@ import type {
   ClusterHealth,
   ClusterStatistics,
   ClusterStatus,
+  GarageCapabilities,
   GarageMetrics,
   MultiNodeResponse,
   MultiNodeStatisticsResponse,
@@ -87,6 +88,11 @@ api.interceptors.response.use(
       return Promise.reject(error);
     }
 
+    // 501 Not Implemented = expected for unsupported Garage version features
+    if (error.response?.status === 501) {
+      return Promise.reject(error);
+    }
+
     // Handle axios errors
     if (error.response) {
       // Server responded with error status
@@ -167,6 +173,14 @@ export const healthApi = {
   },
 };
 
+// Capabilities API
+export const capabilitiesApi = {
+  get: async (): Promise<GarageCapabilities> => {
+    const response = await api.get('/v1/capabilities');
+    return response.data.data;
+  },
+};
+
 // Bucket API
 export const bucketsApi = {
   list: async (): Promise<Bucket[]> => {