Admin requests: paginated API & UI overhaul

Add a paginated Admin Requests API and fully refactor the admin requests UI to support filtering, sorting, pagination, and URL state.

- New API: src/app/api/admin/requests/route.ts implements paginated, searchable, filterable, and sortable request listing with proper relation includes and pagination metadata.
- Frontend: RecentRequestsTable rewritten to fetch via SWR (authenticatedFetcher), read/write URL query params, debounce search, support status/user filters, sortable columns, page size selector, and full pagination UI; added loading/error states and toast feedback for actions.
- Admin page updated to use Suspense and the new RecentRequestsTable (component now fetches its own data).
- Settings: deprecated single download-client PUT route now maps updates into the new multi-client format (download_clients JSON), logs deprecation, and invalidates download client manager; settings GET now reads multi-client config for backward compatibility.
- Processors: monitor-download and retry-failed-imports updated to use the download-client-manager and new PathMappingConfig shape for path mapping logic.
- Minor API/schema updates: request-with-torrent schema extended (indexerId, infoUrl, protocol) and setup complete no longer writes legacy path keys.
- Tests updated to reflect API and processor changes.

This change centralizes request management on the server, modernizes the UI for large datasets, and migrates download client settings toward a multi-client configuration while keeping backward compatibility.

src/lib/processors/monitor-download.processor.ts

@@ -8,8 +8,9 @@ import { MonitorDownloadPayload, getJobQueueService } from '../services/job-queu
 import { prisma } from '../db';
 import { getQBittorrentService } from '../integrations/qbittorrent.service';
 import { RMABLogger } from '../utils/logger';
-import { PathMapper } from '../utils/path-mapper';
+import { PathMapper, PathMappingConfig } from '../utils/path-mapper';
 import { getConfigService } from '../services/config.service';
+import { getDownloadClientManager } from '../services/download-client-manager.service';
 
 /**
  * Helper function to retry getTorrent with exponential backoff
@@ -130,20 +131,23 @@ export async function processMonitorDownload(payload: MonitorDownloadPayload): P
         throw new Error('Download path not available from download client');
       }
 
-      // Load path mapping configuration
+      // Get path mapping configuration from the specific download client
       const configService = getConfigService();
-      const pathMappingConfig = await configService.getMany([
-        'download_client_remote_path_mapping_enabled',
-        'download_client_remote_path',
-        'download_client_local_path',
-      ]);
+      const manager = getDownloadClientManager(configService);
+      const protocol = downloadClient === 'sabnzbd' ? 'usenet' : 'torrent';
+      const clientConfig = await manager.getClientForProtocol(protocol);
+
+      // Build path mapping config from client settings
+      const pathMappingConfig: PathMappingConfig = clientConfig && clientConfig.remotePathMappingEnabled
+        ? {
+            enabled: true,
+            remotePath: clientConfig.remotePath || '',
+            localPath: clientConfig.localPath || '',
+          }
+        : { enabled: false, remotePath: '', localPath: '' };
 
       // Apply remote-to-local path transformation if enabled
-      const organizePath = PathMapper.transform(downloadPath, {
-        enabled: pathMappingConfig.download_client_remote_path_mapping_enabled === 'true',
-        remotePath: pathMappingConfig.download_client_remote_path || '',
-        localPath: pathMappingConfig.download_client_local_path || '',
-      });
+      const organizePath = PathMapper.transform(downloadPath, pathMappingConfig);
 
       logger.info(`Download completed`, {
         downloadClient,