feat: Integrate News Engine Console with Pipeline Monitor service

Backend Integration:
- Created PipelineClient for communicating with Pipeline Monitor (port 8100)
- Added proxy endpoints in monitoring.py:
  * /api/v1/monitoring/pipeline/stats - Queue status and article counts
  * /api/v1/monitoring/pipeline/health - Pipeline service health
  * /api/v1/monitoring/pipeline/queues/{name} - Queue details
  * /api/v1/monitoring/pipeline/workers - Worker status

Frontend Integration:
- Added Pipeline Monitor API functions to monitoring.ts
- Updated Monitoring page to display:
  * Redis queue status (keyword, rss, search, summarize, assembly)
  * Article statistics (today, total, active keywords)
  * Pipeline health status
  * Worker status for each pipeline type

Architecture:
- Console acts as API Gateway, proxying requests to Pipeline Monitor
- Pipeline Monitor (services/pipeline/monitor) manages:
  * RSS Collector, Google Search, AI Summarizer, Article Assembly workers
  * Redis queues for async job processing
  * MongoDB for article and keyword storage

This integration allows the News Engine Console to monitor and display
real-time pipeline activity, queue status, and worker health.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

services/news-engine-console/backend/app/api/monitoring.py

@@ -4,6 +4,7 @@ from datetime import datetime
 
 from app.core.auth import get_current_active_user, User
 from app.core.database import get_database
+from app.core.pipeline_client import get_pipeline_client, PipelineClient
 from app.services.monitoring_service import MonitoringService
 
 router = APIRouter()
@@ -135,3 +136,58 @@ async def get_error_summary(
     """
     summary = await monitoring_service.get_error_summary(hours=hours)
     return summary
+
+
+# =============================================================================
+# Pipeline Monitor Proxy Endpoints
+# =============================================================================
+
+@router.get("/pipeline/stats")
+async def get_pipeline_stats(
+    current_user: User = Depends(get_current_active_user),
+    pipeline_client: PipelineClient = Depends(get_pipeline_client)
+):
+    """
+    Get pipeline statistics from Pipeline Monitor service
+
+    Returns queue status, article counts, and worker info
+    """
+    return await pipeline_client.get_stats()
+
+
+@router.get("/pipeline/health")
+async def get_pipeline_health(
+    current_user: User = Depends(get_current_active_user),
+    pipeline_client: PipelineClient = Depends(get_pipeline_client)
+):
+    """
+    Get Pipeline Monitor service health status
+    """
+    return await pipeline_client.get_health()
+
+
+@router.get("/pipeline/queues/{queue_name}")
+async def get_queue_details(
+    queue_name: str,
+    current_user: User = Depends(get_current_active_user),
+    pipeline_client: PipelineClient = Depends(get_pipeline_client)
+):
+    """
+    Get details for a specific pipeline queue
+
+    Returns queue length, processing count, failed count, and preview of items
+    """
+    return await pipeline_client.get_queue_details(queue_name)
+
+
+@router.get("/pipeline/workers")
+async def get_pipeline_workers(
+    current_user: User = Depends(get_current_active_user),
+    pipeline_client: PipelineClient = Depends(get_pipeline_client)
+):
+    """
+    Get status of all pipeline workers
+
+    Returns active worker counts for each pipeline type
+    """
+    return await pipeline_client.get_workers()