fix: convert test files to ES modules and fix qbittorrent test method calls

- Convert all client test files from CommonJS require() to ES module import syntax
- Convert downloadClients.test.js and integration/downloadClients.test.js to ES modules
- Fix qbittorrent.test.js to use getActiveDownloads() instead of getTorrents()
- All test files now use proper Vitest-compatible ES module syntax
- Resolves Vitest import errors and QBittorrentClient method call errors

tests/unit/qbittorrent.test.js

@@ -156,7 +156,7 @@ describe('QBittorrentClient sync API', () => {
       }
     });
 
-    const torrents = await client.getTorrents();
+    const torrents = await client.getActiveDownloads();
     expect(torrents).toHaveLength(1);
     expect(torrents[0].name).toBe('Test1');
     expect(torrents[0].instanceId).toBe('test-qbt');
@@ -188,7 +188,7 @@ describe('QBittorrentClient sync API', () => {
       }
     });
 
-    const torrents = await client.getTorrents();
+    const torrents = await client.getActiveDownloads();
     expect(torrents).toHaveLength(1);
     expect(torrents[0].dlspeed).toBe(200);
     expect(torrents[0].name).toBe('Test1');
@@ -219,7 +219,7 @@ describe('QBittorrentClient sync API', () => {
       }
     });
 
-    const torrents = await client.getTorrents();
+    const torrents = await client.getActiveDownloads();
     expect(torrents).toHaveLength(1);
     expect(torrents[0].name).toBe('Test2');
     expect(torrents[0].hash).toBe('hash02');
@@ -238,7 +238,7 @@ describe('QBittorrentClient sync API', () => {
         hash01: { name: 'Test1', state: 'downloading', size: 1000, progress: 0.5, dlspeed: 100, eta: 60, num_seeds: 5, num_leechs: 2, availability: 1.0 }
       }
     });
-    await client.getTorrents();
+    await client.getActiveDownloads();
 
     mockSync(1, {
       rid: 2,
@@ -246,7 +246,7 @@ describe('QBittorrentClient sync API', () => {
       torrents_removed: ['hash01']
     });
 
-    const torrents = await client.getTorrents();
+    const torrents = await client.getActiveDownloads();
     expect(torrents).toHaveLength(0);
   });
 
@@ -267,7 +267,7 @@ describe('QBittorrentClient sync API', () => {
         { name: 'Fallback', hash: 'fb01', state: 'downloading', size: 1073741824, progress: 0.5, dlspeed: 1048576, eta: 512, num_seeds: 10, num_leechs: 3, availability: 1.0 }
       ]);
 
-    const torrents = await client.getTorrents();
+    const torrents = await client.getActiveDownloads();
     expect(torrents).toHaveLength(1);
     expect(torrents[0].name).toBe('Fallback');
     expect(client.fallbackThisCycle).toBe(true);
@@ -292,7 +292,7 @@ describe('QBittorrentClient sync API', () => {
       .get('/api/v2/sync/maindata?rid=0')
       .reply(200, { rid: 1, full_update: true });
 
-    const torrents = await client.getTorrents();
+    const torrents = await client.getActiveDownloads();
     expect(torrents).toHaveLength(1);
     expect(torrents[0].name).toBe('DirectLegacy');
     expect(syncScope.isDone()).toBe(false);
@@ -324,7 +324,7 @@ describe('QBittorrentClient sync API', () => {
         }
       });
 
-    const torrents = await client.getTorrents();
+    const torrents = await client.getActiveDownloads();
     expect(torrents).toHaveLength(1);
     expect(torrents[0].name).toBe('AfterReauth');
   });
@@ -342,7 +342,7 @@ describe('QBittorrentClient sync API', () => {
       }
     });
 
-    const torrents = await client.getTorrents();
+    const torrents = await client.getActiveDownloads();
     expect(torrents[0].completed).toBe(500);
   });
 
@@ -363,7 +363,7 @@ describe('QBittorrentClient sync API', () => {
 
     // Simulate the reset that getAllTorrents performs
     client.fallbackThisCycle = false;
-    const torrents = await client.getTorrents();
+    const torrents = await client.getActiveDownloads();
     expect(torrents[0].name).toBe('ResetWorks');
     expect(client.fallbackThisCycle).toBe(false);
   });