refactor: remove all backward compatibility code across 70 files

Clean up 28 backward compatibility instances identified in the codebase.
The app is not live, so all shims are replaced with the target architecture:

- Remove legacy Inventory.location column (use bin_location exclusively)
- Remove dashboard _extract_metric_value helper (use flat metrics dict)
- Remove legacy stat field duplicates (total_stores, total_imports, etc.)
- Remove 13 re-export shims and class aliases across modules
- Remove module-enabling JSON fallback (use PlatformModule junction table)
- Remove menu_to_legacy_format() conversion (return dataclasses directly)
- Remove title/description from MarketplaceProductBase schema
- Clean billing convenience method docstrings
- Clean test fixtures and backward-compat comments
- Add PlatformModule seeding to init_production.py

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

app/modules/inventory/services/inventory_import_service.py

@@ -176,7 +176,6 @@ class InventoryImportService:
                         store_id=store_id,
                         warehouse=warehouse,
                         bin_location=bin_loc,
-                        location=bin_loc,  # Legacy field
                         quantity=quantity,
                         gtin=ean,
                     )

app/modules/inventory/services/inventory_metrics.py

@@ -81,7 +81,7 @@ class InventoryMetricsProvider:
 
             # Unique locations
             unique_locations = (
-                db.query(func.count(func.distinct(Inventory.location)))
+                db.query(func.count(func.distinct(Inventory.bin_location)))
                 .filter(Inventory.store_id == store_id)
                 .scalar()
                 or 0

app/modules/inventory/services/inventory_service.py

@@ -86,8 +86,7 @@ class InventoryService:
                 product_id=inventory_data.product_id,
                 store_id=store_id,
                 warehouse="strassen",  # Default warehouse
-                bin_location=location,  # Use location as bin location
-                location=location,  # Keep for backward compatibility
+                bin_location=location,
                 quantity=inventory_data.quantity,
                 gtin=product.marketplace_product.gtin,  # Optional reference
             )
@@ -154,8 +153,7 @@ class InventoryService:
                     product_id=inventory_data.product_id,
                     store_id=store_id,
                     warehouse="strassen",  # Default warehouse
-                    bin_location=location,  # Use location as bin location
-                    location=location,  # Keep for backward compatibility
+                    bin_location=location,
                     quantity=inventory_data.quantity,
                     gtin=product.marketplace_product.gtin,
                 )
@@ -445,7 +443,7 @@ class InventoryService:
 
             locations = [
                 InventoryLocationResponse(
-                    location=inv.location,
+                    location=inv.bin_location,
                     quantity=inv.quantity,
                     reserved_quantity=inv.reserved_quantity,
                     available_quantity=inv.available_quantity,
@@ -500,7 +498,7 @@ class InventoryService:
             query = db.query(Inventory).filter(Inventory.store_id == store_id)
 
             if location:
-                query = query.filter(Inventory.location.ilike(f"%{location}%"))
+                query = query.filter(Inventory.bin_location.ilike(f"%{location}%"))
 
             if low_stock_threshold is not None:
                 query = query.filter(Inventory.quantity <= low_stock_threshold)
@@ -541,7 +539,7 @@ class InventoryService:
                 inventory.reserved_quantity = inventory_update.reserved_quantity
 
             if inventory_update.location:
-                inventory.location = self._validate_location(inventory_update.location)
+                inventory.bin_location = self._validate_location(inventory_update.location)
 
             inventory.updated_at = datetime.now(UTC)
             db.flush()
@@ -624,7 +622,7 @@ class InventoryService:
             query = query.filter(Inventory.store_id == store_id)
 
         if location:
-            query = query.filter(Inventory.location.ilike(f"%{location}%"))
+            query = query.filter(Inventory.bin_location.ilike(f"%{location}%"))
 
         if low_stock is not None:
             query = query.filter(Inventory.quantity <= low_stock)
@@ -668,7 +666,7 @@ class InventoryService:
                     store_code=store.store_code if store else None,
                     product_title=title,
                     product_sku=product.store_sku if product else None,
-                    location=inv.location,
+                    location=inv.bin_location,
                     quantity=inv.quantity,
                     reserved_quantity=inv.reserved_quantity,
                     available_quantity=inv.available_quantity,
@@ -717,7 +715,7 @@ class InventoryService:
 
         # Unique locations
         unique_locations = (
-            db.query(func.count(func.distinct(Inventory.location))).scalar() or 0
+            db.query(func.count(func.distinct(Inventory.bin_location))).scalar() or 0
         )
 
         return AdminInventoryStats(
@@ -768,7 +766,7 @@ class InventoryService:
                     store_id=inv.store_id,
                     store_name=store.name if store else None,
                     product_title=title,
-                    location=inv.location,
+                    location=inv.bin_location,
                     quantity=inv.quantity,
                     reserved_quantity=inv.reserved_quantity,
                     available_quantity=inv.available_quantity,
@@ -808,7 +806,7 @@ class InventoryService:
         self, db: Session, store_id: int | None = None
     ) -> AdminInventoryLocationsResponse:
         """Get list of unique inventory locations (admin only)."""
-        query = db.query(func.distinct(Inventory.location))
+        query = db.query(func.distinct(Inventory.bin_location))
 
         if store_id is not None:
             query = query.filter(Inventory.store_id == store_id)
@@ -859,7 +857,7 @@ class InventoryService:
                     store_code=store.store_code,
                     product_title=title,
                     product_sku=product.store_sku if product else None,
-                    location=inv.location,
+                    location=inv.bin_location,
                     quantity=inv.quantity,
                     reserved_quantity=inv.reserved_quantity,
                     available_quantity=inv.available_quantity,
@@ -874,7 +872,7 @@ class InventoryService:
             Inventory.store_id == store_id
         )
         if location:
-            total_query = total_query.filter(Inventory.location.ilike(f"%{location}%"))
+            total_query = total_query.filter(Inventory.bin_location.ilike(f"%{location}%"))
         if low_stock is not None:
             total_query = total_query.filter(Inventory.quantity <= low_stock)
         total = total_query.scalar() or 0
@@ -940,7 +938,7 @@ class InventoryService:
         """Get inventory entry by product and location."""
         return (
             db.query(Inventory)
-            .filter(Inventory.product_id == product_id, Inventory.location == location)
+            .filter(Inventory.product_id == product_id, Inventory.bin_location == location)
             .first()
         )