Add endpoint for creating local contacts with access control

Introduced a new `local_contact_router` to handle creation of local contacts. The endpoint enforces role-based access control and ensures no duplication of email addresses. Updated the router exports for consistency and cleaned up a large test file to improve readability.

backend/app/routers/logistics.py

@@ -351,7 +351,7 @@ async def get_all_dewars(db: Session = Depends(get_db)):
 
 @router.get("/dewar/table", response_model=List[DewarTable])
 async def get_all_dewars_table(db: Session = Depends(get_db)):
-    dewars = db.query(DewarModel).all()
+    dewars = db.query(DewarModel).filter(DewarModel.events.any()).all()
 
     # Flatten relationships for simplified frontend rendering
     response = []
@@ -365,6 +365,7 @@ async def get_all_dewars_table(db: Session = Depends(get_db)):
                 dewar_name=dewar.dewar_name,
                 shipment_name=dewar.shipment.shipment_name if dewar.shipment else "N/A",
                 # Use the most recent event if available
+                beamtime=dewar.beamtime,
                 status=dewar.events[-1].event_type if dewar.events else "No Events",
                 tracking_number=dewar.tracking_number or "N/A",
                 slot_id=dewar.slot[0].id