feat: implement podcast discovery with PodcastIndex API integration and Discover page

frontend/src/services/discoveryService.ts

@@ -0,0 +1,54 @@
+import api from './api';
+
+export interface DiscoveryPodcast {
+  id: string;
+  title: string;
+  rssUrl: string;
+  description: string;
+  author?: string;
+  imageUrl?: string;
+  language?: string;
+  episodeCount?: number;
+}
+
+export interface DiscoveryResponse {
+  source: 'podcastindex' | 'local';
+  podcasts: DiscoveryPodcast[];
+  count: number;
+  message?: string;
+}
+
+export const discoveryService = {
+  discoverPodcasts: async (
+    query: string,
+    limit: number = 20,
+    offset: number = 0
+  ): Promise<DiscoveryResponse> => {
+    const response = await api.get('/podcasts/discover', {
+      params: { q: query, limit, offset },
+    });
+    return response.data;
+  },
+
+  getTrendingPodcasts: async (limit: number = 20): Promise<DiscoveryResponse> => {
+    const response = await api.get('/podcasts/trending', {
+      params: { limit },
+    });
+    return response.data;
+  },
+
+  subscribeFromDiscovery: async (
+    rssUrl: string,
+    metadata?: {
+      title?: string;
+      author?: string;
+      imageUrl?: string;
+    }
+  ): Promise<{ message: string; podcast: any }> => {
+    const response = await api.post('/podcasts/subscribe-discovery', {
+      rssUrl,
+      ...metadata,
+    });
+    return response.data;
+  },
+};