Pick cheapest GPU SKU and pin the VM to an existing disk AZ.

Scan ru-6 by Nova availability zones (a/b/c). First boot uses FLAVOR_SIZE_PRESET=cheap; reruns stay on the disk segment.

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

tests/test_pools.py

@@ -1,4 +1,4 @@
-from gpu_rent.pools import PoolGpuOffer, format_pool_scan
+from gpu_rent.pools import AzGpuOffer, PoolGpuOffer, format_pool_scan
 
 
 def test_format_pool_scan_recommends_first_hit():
@@ -14,9 +14,41 @@ def test_format_pool_scan_recommends_first_hit():
             matched=[
                 FlavorInfo("1", "GL-4090", 4, 16384, False, {}, "4090-24"),
             ],
+            recommended_az="ru-6a",
+            segments=[
+                AzGpuOffer(
+                    az="ru-6a",
+                    gpu_labels_found=["4090-24"],
+                    gpu_types=["RTX4090"],
+                    matched=[FlavorInfo("1", "GL-4090", 4, 16384, False, {}, "4090-24")],
+                ),
+                AzGpuOffer(az="ru-6b", gpu_labels_found=[], gpu_types=["H200"], matched=[]),
+                AzGpuOffer(az="ru-6c", gpu_labels_found=[], gpu_types=["H200"], matched=[]),
+            ],
         ),
     ]
     text = "\n".join(format_pool_scan(offers, ("4090-24", "4090-48")))
     assert "ru-6" in text and "multizone" in text
     assert "типы:" in text
+    assert "ru-6a" in text and "ru-6b" in text and "ru-6c" in text
     assert "рекомендация:" in text and "OS_REGION_NAME=ru-6" in text
+    assert "GPU_RENT_AZ=ru-6a" in text
+
+
+def test_format_pool_scan_pins_disk_az():
+    from gpu_rent.inventory import FlavorInfo
+
+    offers = [
+        PoolGpuOffer(
+            region="ru-6",
+            multizone=True,
+            gpu_labels_found=["4090-24"],
+            gpu_types=["RTX4090"],
+            matched=[FlavorInfo("1", "GL-4090", 4, 16384, False, {}, "4090-24")],
+            recommended_az="ru-6a",
+        )
+    ]
+    text = "\n".join(
+        format_pool_scan(offers, ("4090-24",), pin_az="ru-6a", size_preset="cheap")
+    )
+    assert "диск уже в ru-6a" in text