feat: add SSE event stream for print jobs, implement batch printing in frontend, and update API documentation.

paperless-backend/src/label-print-agent/label-print-agent.controller.ts

@@ -4,16 +4,20 @@ import {
   Get,
   HttpCode,
   HttpStatus,
+  MessageEvent,
   NotFoundException,
   Param,
   ParseIntPipe,
   Post,
   Query,
   Res,
+  Sse,
   StreamableFile,
   UseGuards,
 } from '@nestjs/common';
 import type { Response } from 'express';
+import { Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
 import { JwtOrApiKeyGuard } from '../auth/jwt-or-apikey.guard';
 import { RequirePermissions } from '../auth/permissions.decorator';
 import { Permission } from '../auth/permissions.enum';
@@ -48,6 +52,14 @@ export class LabelPrintAgentController {
     return { jobId: String(job.Id) };
   }
 
+  // Agent: SSE-Stream für neue Druckaufträge
+  @Sse('events')
+  sseEvents(): Observable<MessageEvent> {
+    return this.service.newJob$.pipe(
+      map(() => ({ data: { type: 'label-job-available' } } as MessageEvent)),
+    );
+  }
+
   // Agent: nächsten Job abholen (Polling)
   @Get('jobs/next')
   async getNextJob(@Query('agentId') agentId: string, @Res({ passthrough: true }) res: Response) {