fix(xiaoyuzhou): correct podcast-episodes API endpoint (jackwener#1129)

* fix(xiaoyuzhou): correct podcast-episodes API endpoint

The endpoint `/v1/podcast/listEpisode` returns 404. The correct
endpoint is `/v1/episode/list` (verified against Xiaoyuzhou iOS app
traffic; also matches the `episode-list` implementation in
ultrazg/xyz, a widely-used Xiaoyuzhou API wrapper).

Additionally, the server requires an `order` field in the request
body (returns 400 if omitted). Add `order: 'desc'` so callers get
the latest episodes first, matching typical UX for a podcast feed.

Before:  podcast-episodes -> HTTP 404 for every podcast
After:   podcast-episodes returns the N most recent episodes

Tested against real podcast 626b46ea9cbbf0451cf5a962
(张小珺｜商业访谈录) — now returns 140 episodes correctly.

* test(xiaoyuzhou): lock podcast episodes endpoint

---------

Co-authored-by: jackwener <jakevingoo@gmail.com>

Author: CrisJing

clis/xiaoyuzhou/podcast-episodes.js

@@ -20,9 +20,9 @@ cli({
             throw new CliError('INVALID_ARGUMENT', 'limit must be a positive integer', 'Example: --limit 5');
         }
         const credentials = loadXiaoyuzhouCredentials();
-        const response = await requestXiaoyuzhouJson('/v1/podcast/listEpisode', {
+        const response = await requestXiaoyuzhouJson('/v1/episode/list', {
             method: 'POST',
-            body: { pid: args.id, limit: requestedLimit },
+            body: { pid: args.id, order: 'desc', limit: requestedLimit },
             credentials,
         });
         const episodes = response.data ?? [];

clis/xiaoyuzhou/podcast-episodes.test.js

@@ -0,0 +1,78 @@
+import { beforeAll, beforeEach, describe, expect, it, vi } from 'vitest';
+import { getRegistry } from '@jackwener/opencli/registry';
+
+const { mockRequestJson, mockLoadCredentials } = vi.hoisted(() => ({
+    mockRequestJson: vi.fn(),
+    mockLoadCredentials: vi.fn(),
+}));
+
+vi.mock('./auth.js', async () => {
+    const actual = await vi.importActual('./auth.js');
+    return {
+        ...actual,
+        requestXiaoyuzhouJson: mockRequestJson,
+        loadXiaoyuzhouCredentials: mockLoadCredentials,
+    };
+});
+
+await import('./podcast-episodes.js');
+
+let cmd;
+
+beforeAll(() => {
+    cmd = getRegistry().get('xiaoyuzhou/podcast-episodes');
+    expect(cmd?.func).toBeTypeOf('function');
+});
+
+describe('xiaoyuzhou podcast-episodes', () => {
+    beforeEach(() => {
+        mockRequestJson.mockReset();
+        mockLoadCredentials.mockReset();
+        mockLoadCredentials.mockReturnValue({ access_token: 'access', refresh_token: 'refresh' });
+    });
+
+    it('calls the fixed episode list endpoint with desc ordering', async () => {
+        mockRequestJson.mockResolvedValue({
+            data: [
+                {
+                    eid: 'ep-1',
+                    title: 'Episode 1',
+                    duration: 3661,
+                    playCount: 42,
+                    pubDate: '2026-04-20T10:00:00.000Z',
+                },
+            ],
+        });
+
+        const result = await cmd.func(null, {
+            id: 'podcast-1',
+            limit: 3,
+        });
+
+        expect(mockRequestJson).toHaveBeenCalledWith('/v1/episode/list', {
+            method: 'POST',
+            body: { pid: 'podcast-1', order: 'desc', limit: 3 },
+            credentials: { access_token: 'access', refresh_token: 'refresh' },
+        });
+        expect(result).toEqual([
+            {
+                eid: 'ep-1',
+                title: 'Episode 1',
+                duration: '61:01',
+                plays: 42,
+                date: '2026-04-20',
+            },
+        ]);
+    });
+
+    it('rejects non-positive limits before hitting the API', async () => {
+        await expect(cmd.func(null, {
+            id: 'podcast-1',
+            limit: 0,
+        })).rejects.toMatchObject({
+            code: 'INVALID_ARGUMENT',
+            message: 'limit must be a positive integer',
+        });
+        expect(mockRequestJson).not.toHaveBeenCalled();
+    });
+});