feat: add POST /CargoTrace/location endpoint

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

app/api/v1/location.py

@@ -0,0 +1,18 @@
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+
+from app.core.database import get_db
+from app.schemas.location import LocationRequest, LocationResponse
+from app.services.location_service import register_location
+
+router = APIRouter()
+
+
+@router.post("/location", response_model=LocationResponse)
+def create_location(req: LocationRequest, db: Session = Depends(get_db)):
+    record = register_location(db, req)
+    return LocationResponse(
+        zongpai_no=record.zongpai_no,
+        location_code=record.location_code,
+        created_at=record.created_at.isoformat(),
+    )