feat: add Agrarmonitor integration module

- New backend module (agrarmonitor) with status check and device registration
- Frontend settings tab with connection status display and registration form
- Environment variables for base URLs, credentials, cookie path and encryption key
- Docker Compose env passthrough for agrarmonitor config

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

paperless-backend/src/app.module.ts

@@ -18,6 +18,7 @@ import { BarcodeModule } from './barcode/barcode.module';
 import { InboxPostprocessorModule } from './inbox-postprocessor/inbox-postprocessor.module';
 import { UserSettingsModule } from './user-settings/user-settings.module';
 import { LabelPrintAgentModule } from './label-print-agent/label-print-agent.module';
+import { AgrarmonitorModule } from './agrarmonitor/agrarmonitor.module';
 import * as path from 'path';
 
 @Module({
@@ -47,6 +48,7 @@ import * as path from 'path';
     InboxPostprocessorModule,
     UserSettingsModule,
     LabelPrintAgentModule,
+    AgrarmonitorModule,
   ],
 })
 export class AppModule {}