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/admin/settings/interactive-search/route.ts

@@ -0,0 +1,91 @@
+/**
+ * Component: Admin Interactive Search Settings API
+ * Documentation: documentation/settings-pages.md
+ */
+
+import { NextRequest, NextResponse } from 'next/server';
+import { requireAuth, requireAdmin, AuthenticatedRequest } from '@/lib/middleware/auth';
+import { prisma } from '@/lib/db';
+import { RMABLogger } from '@/lib/utils/logger';
+
+const logger = RMABLogger.create('API.Admin.Settings.InteractiveSearch');
+
+const CONFIG_KEY = 'interactive_search_access';
+
+/**
+ * GET /api/admin/settings/interactive-search
+ * Get current global interactive search access setting
+ */
+export async function GET(request: NextRequest) {
+  return requireAuth(request, async (req: AuthenticatedRequest) => {
+    return requireAdmin(req, async () => {
+      try {
+        const config = await prisma.configuration.findUnique({
+          where: { key: CONFIG_KEY },
+        });
+
+        // Default to true if not configured (backward compatibility)
+        const interactiveSearchAccess = config === null ? true : config.value === 'true';
+
+        return NextResponse.json({ interactiveSearchAccess });
+      } catch (error) {
+        logger.error('Failed to fetch interactive search setting', {
+          error: error instanceof Error ? error.message : String(error)
+        });
+        return NextResponse.json(
+          { error: 'Failed to fetch interactive search setting' },
+          { status: 500 }
+        );
+      }
+    });
+  });
+}
+
+/**
+ * PATCH /api/admin/settings/interactive-search
+ * Update global interactive search access setting
+ */
+export async function PATCH(request: NextRequest) {
+  return requireAuth(request, async (req: AuthenticatedRequest) => {
+    return requireAdmin(req, async () => {
+      try {
+        const body = await request.json();
+        const { interactiveSearchAccess } = body;
+
+        // Validate input
+        if (typeof interactiveSearchAccess !== 'boolean') {
+          return NextResponse.json(
+            { error: 'Invalid input. interactiveSearchAccess must be a boolean' },
+            { status: 400 }
+          );
+        }
+
+        // Update configuration
+        await prisma.configuration.upsert({
+          where: { key: CONFIG_KEY },
+          create: {
+            key: CONFIG_KEY,
+            value: interactiveSearchAccess.toString(),
+          },
+          update: {
+            value: interactiveSearchAccess.toString(),
+          },
+        });
+
+        logger.info(`Interactive search access setting updated to: ${interactiveSearchAccess}`, {
+          userId: req.user?.sub,
+        });
+
+        return NextResponse.json({ interactiveSearchAccess });
+      } catch (error) {
+        logger.error('Failed to update interactive search setting', {
+          error: error instanceof Error ? error.message : String(error)
+        });
+        return NextResponse.json(
+          { error: 'Failed to update interactive search setting' },
+          { status: 500 }
+        );
+      }
+    });
+  });
+}