fix: resolve remaining Inventory.location test failures and add Grafana config fields

- Fix test_inventory_service.py: replace model .location with .bin_location
- Fix test_product_model.py: remove location= from Inventory constructors
- Add grafana_admin_user/password to Settings for production Grafana config

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

tests/unit/services/test_inventory_service.py

@@ -107,7 +107,7 @@ class TestInventoryService:
 
         assert result.product_id == test_product.id
         assert result.store_id == test_store.id
-        assert result.location == f"WAREHOUSE_NEW_{unique_id}"
+        assert result.bin_location == f"WAREHOUSE_NEW_{unique_id}"
         assert result.quantity == 100
 
     def test_set_inventory_existing_entry_replaces(
@@ -116,7 +116,7 @@ class TestInventoryService:
         """Test setting inventory replaces existing quantity."""
         inventory_data = InventoryCreate(
             product_id=test_product.id,
-            location=test_inventory.location,
+            location=test_inventory.bin_location,
             quantity=200,
         )
 
@@ -175,7 +175,7 @@ class TestInventoryService:
 
         inventory_data = InventoryAdjust(
             product_id=test_product.id,
-            location=test_inventory.location,
+            location=test_inventory.bin_location,
             quantity=25,
         )
 
@@ -191,7 +191,7 @@ class TestInventoryService:
 
         inventory_data = InventoryAdjust(
             product_id=test_product.id,
-            location=test_inventory.location,
+            location=test_inventory.bin_location,
             quantity=-10,
         )
 
@@ -207,7 +207,7 @@ class TestInventoryService:
 
         inventory_data = InventoryAdjust(
             product_id=test_product.id,
-            location=test_inventory.location,
+            location=test_inventory.bin_location,
             quantity=-(test_inventory.quantity + 100),  # More than available
         )
 
@@ -239,7 +239,7 @@ class TestInventoryService:
 
         reserve_data = InventoryReserve(
             product_id=test_product.id,
-            location=test_inventory.location,
+            location=test_inventory.bin_location,
             quantity=reserve_qty,
         )
 
@@ -257,7 +257,7 @@ class TestInventoryService:
 
         reserve_data = InventoryReserve(
             product_id=test_product.id,
-            location=test_inventory.location,
+            location=test_inventory.bin_location,
             quantity=available + 100,  # More than available
         )
 
@@ -288,7 +288,7 @@ class TestInventoryService:
 
         reserve_data = InventoryReserve(
             product_id=test_product.id,
-            location=test_inventory.location,
+            location=test_inventory.bin_location,
             quantity=release_qty,
         )
 
@@ -302,7 +302,7 @@ class TestInventoryService:
         """Test releasing more than reserved sets to zero (doesn't error)."""
         reserve_data = InventoryReserve(
             product_id=test_product.id,
-            location=test_inventory.location,
+            location=test_inventory.bin_location,
             quantity=test_inventory.reserved_quantity + 100,
         )
 
@@ -322,7 +322,7 @@ class TestInventoryService:
 
         reserve_data = InventoryReserve(
             product_id=test_product.id,
-            location=test_inventory.location,
+            location=test_inventory.bin_location,
             quantity=fulfill_qty,
         )
 
@@ -339,7 +339,7 @@ class TestInventoryService:
 
         reserve_data = InventoryReserve(
             product_id=test_product.id,
-            location=test_inventory.location,
+            location=test_inventory.bin_location,
             quantity=test_inventory.quantity + 100,
         )
 
@@ -423,12 +423,12 @@ class TestInventoryService:
     ):
         """Test getting store inventory filtered by location."""
         result = self.service.get_store_inventory(
-            db, test_store.id, location=test_inventory.location[:10]
+            db, test_store.id, location=test_inventory.bin_location[:10]
         )
 
         assert len(result) >= 1
         for inv in result:
-            assert test_inventory.location[:10].upper() in inv.location.upper()
+            assert test_inventory.bin_location[:10].upper() in inv.bin_location.upper()
 
     def test_get_store_inventory_with_low_stock_filter(self, db, test_store):
         """Test getting store inventory filtered by low stock threshold."""
@@ -477,7 +477,7 @@ class TestInventoryService:
             db, test_store.id, test_inventory.id, inventory_update
         )
 
-        assert result.location == new_location.upper()
+        assert result.bin_location == new_location.upper()
 
     def test_update_inventory_not_found(self, db, test_store):
         """Test updating non-existent inventory raises InventoryNotFoundException."""
@@ -570,7 +570,7 @@ class TestInventoryService:
         self, db, test_inventory
     ):
         """Test get_all_inventory_admin filters by location."""
-        location_prefix = test_inventory.location[:5]
+        location_prefix = test_inventory.bin_location[:5]
         result = self.service.get_all_inventory_admin(
             db, location=location_prefix
         )
@@ -614,7 +614,6 @@ class TestInventoryService:
             store_id=test_store.id,
             warehouse="strassen",
             bin_location=f"LOW_{unique_id}",
-            location=f"LOW_{unique_id}",
             quantity=3,
             reserved_quantity=0,
         )
@@ -650,7 +649,7 @@ class TestInventoryService:
         result = self.service.get_inventory_locations_admin(db)
 
         assert len(result.locations) >= 1
-        assert test_inventory.location in result.locations
+        assert test_inventory.bin_location in result.locations
 
     def test_get_inventory_locations_admin_with_store_filter(
         self, db, test_inventory, test_store
@@ -760,7 +759,7 @@ class TestInventoryService:
     ):
         """Test _get_inventory_entry returns existing entry."""
         result = self.service._get_inventory_entry(
-            db, test_product.id, test_inventory.location
+            db, test_product.id, test_inventory.bin_location
         )
 
         assert result is not None