feat(backend): add sample options for freight config dialog

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/api/sample_freight.py

@@ -100,6 +100,34 @@ async def list_sample_freights(
         return error_response(400, str(e))
 
 
+@router.get("/sample-freights/sample-options")
+async def list_sample_freight_options(
+    page: int = Query(1, ge=1),
+    pageSize: int = Query(20, ge=1, le=100, alias="pageSize"),
+    keyword: Optional[str] = None,
+    sampleSource: Optional[str] = None,
+    user: dict = Depends(require_admin_or_super_admin),
+    db: Session = Depends(get_db),
+):
+    try:
+        tenant_no = _get_tenant_no(db, user)
+        items, total = freight_svc.list_sample_options(
+            db,
+            tenant_no=tenant_no,
+            page=page,
+            page_size=pageSize,
+            keyword=keyword,
+            sample_source=sampleSource,
+        )
+        return success_response(
+            {"list": items, "total": total, "page": page, "pageSize": pageSize}
+        )
+    except PermissionError as e:
+        return error_response(403, str(e))
+    except ValueError as e:
+        return error_response(400, str(e))
+
+
 @router.get("/sample-freights/{freight_id}")
 async def get_sample_freight(
     freight_id: str,