M6: implement ITWorx MCP Hub publication

Four read-only, service-token-protected MCP provider endpoints (operations summary, attention vehicles, vehicle details, knowledge search facade). Shared-secret auth reusing the M4 callback pattern. Service-request audit trail for every call. Extracted shared operations-summary logic out of the dashboard router to avoid duplicating retrieval logic. 66 backend tests passing, ruff clean. Verified all four endpoints and audit trail directly via curl against the live stack (no live MCP Hub instance available in this environment).

backend/app/api/routers/dashboard.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 from datetime import date, datetime
 
 from fastapi import APIRouter, Depends
-from sqlalchemy import func, select
+from sqlalchemy import select
 from sqlalchemy.orm import Session
 
 from app.api.deps import get_current_user, get_db
@@ -17,10 +17,10 @@ from app.schemas import (
     AttentionItem,
     AutomationRunOut,
     CurrentUser,
-    DashboardMetrics,
     DashboardOut,
     TodayItem,
 )
+from app.services.operations import compute_metrics
 
 router = APIRouter(prefix="/api/v1/dashboard", tags=["dashboard"])
 settings = get_settings()
@@ -37,28 +37,7 @@ def get_dashboard(
     db: Session = Depends(get_db),
     _user: CurrentUser = Depends(get_current_user),
 ) -> DashboardOut:
-    status_counts = dict(
-        db.execute(
-            select(Vehicle.operational_status, func.count()).group_by(Vehicle.operational_status)
-        ).all()
-    )
-    open_issues = db.scalar(
-        select(func.count()).select_from(DataQualityIssue).where(DataQualityIssue.status == "open")
-    )
-    pending_or_failed = db.scalar(
-        select(func.count())
-        .select_from(OutboxEvent)
-        .where(OutboxEvent.delivery_status.in_(["pending", "failed"]))
-    )
-    metrics = DashboardMetrics(
-        available=status_counts.get("available", 0),
-        rented=status_counts.get("rented", 0),
-        cleaning=status_counts.get("cleaning", 0),
-        maintenance=status_counts.get("maintenance", 0),
-        blocked=status_counts.get("blocked", 0),
-        open_quality_issues=open_issues or 0,
-        pending_or_failed_workflows=pending_or_failed or 0,
-    )
+    metrics = compute_metrics(db)
 
     vehicles_by_id = {v.id: v for v in db.scalars(select(Vehicle)).all()}
     customers_by_id = {c.id: c for c in db.scalars(select(Customer)).all()}