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/setup/test-abs/route.ts

@@ -4,10 +4,12 @@
  */
 
 import { NextRequest, NextResponse } from 'next/server';
+import { requireSetupIncomplete } from '@/lib/middleware/auth';
 
 export async function POST(request: NextRequest) {
+  return requireSetupIncomplete(request, async (req) => {
   try {
-    const { serverUrl, apiToken } = await request.json();
+    const { serverUrl, apiToken } = await req.json();
 
     if (!serverUrl) {
       return NextResponse.json(
@@ -79,4 +81,5 @@ export async function POST(request: NextRequest) {
       { status: 500 }
     );
   }
+  });
 }