Add Transmission/NZBGet and per-client paths and much more

Extend multi-download-client support to include Transmission and NZBGet and introduce per-client custom download paths. Adds protocol mapping and new client types, Transmission/NZBGet integration services, API CRUD and validation changes, UI components/modal updates and live path previews, and manager routing by protocol. Includes DB migrations (download_path on download_history, interactive_search_access on users), schema updates, and related processor/service fixes and tests to ensure backward compatibility and proper path resolution.

src/app/api/requests/[id]/interactive-search/route.ts

@@ -9,6 +9,7 @@ import { prisma } from '@/lib/db';
 import { getProwlarrService } from '@/lib/integrations/prowlarr.service';
 import { rankTorrents } from '@/lib/utils/ranking-algorithm';
 import { RMABLogger } from '@/lib/utils/logger';
+import { resolveInteractiveSearchAccess } from '@/lib/utils/permissions';
 
 const logger = RMABLogger.create('API.InteractiveSearch');
 
@@ -71,6 +72,18 @@ export async function POST(
         );
       }
 
+      // Check interactive search access permission
+      const callingUser = await prisma.user.findUnique({
+        where: { id: req.user.id },
+        select: { role: true, interactiveSearchAccess: true },
+      });
+      if (!callingUser || !(await resolveInteractiveSearchAccess(callingUser.role, callingUser.interactiveSearchAccess))) {
+        return NextResponse.json(
+          { error: 'Forbidden', message: 'You do not have interactive search access. Contact your admin to enable this permission.' },
+          { status: 403 }
+        );
+      }
+
       // Get enabled indexers from configuration
       const { getConfigService } = await import('@/lib/services/config.service');
       const configService = getConfigService();