feat: Show Registered Services on Ingress Proxy page

Replace "Instance Routes" with "Registered Services" on the Central
Ingress page. Services are fetched from /api/v1/services and display
name, domain, backend, source, reach level, and backend type.

Central no longer manages instances directly — it shows services
registered by Wild Cloud, Wild Works, and itself.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/src/services/api/networking.ts

@@ -1,5 +1,26 @@
 import { apiClient } from './client';
 
+// Services
+
+export interface RegisteredService {
+  name: string;
+  source: string;
+  domain: string;
+  backend: {
+    address: string;
+    type: string;
+    health?: string;
+  };
+  reach: string;
+  tls?: string;
+}
+
+export const servicesApi = {
+  async list(): Promise<{ services: RegisteredService[] }> {
+    return apiClient.get('/api/v1/services');
+  },
+};
+
 // HAProxy
 
 export interface HaproxyInstanceRoute {