User-supplied asset ids; brand on product; strain is the name

Four UX changes after using the rework for a bit:

1. Asset ids are 6-digit numbers from a roll of physical labels — server
   no longer generates them. POST /api/inventory requires assetId; the
   add-inventory form has a digits-only input that auto-focuses on entry.
2. Strain and product name are the same thing. Drop products.name; the
   strain's name supplies the display. Product creation just asks for
   "Name (strain)" and matches/creates a strain by that name.
3. Brand moves from inventory_items to products. SKUs are brand-specific,
   so all instances of a product share the brand. Brand selector lives
   on the product create/edit form, not the per-instance form.
4. Scanning an unknown SKU on the add-inventory step now opens the
   create-product subform with the SKU prefilled — one less click.

Migration: detect prior shape (products.name column present) and rename
products/inventory_items/audits to *_v1 archives, recreate empty.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/src/routes/bootstrap.ts

@@ -6,8 +6,8 @@ export const bootstrapRouter: Router = Router();
 type ProductRow = {
   id: string;
   sku: string;
-  strain_id: string | null;
-  name: string;
+  strain_id: string;
+  brand_id: string | null;
   type: string;
   kind: string;
   created_at: string;
@@ -17,7 +17,6 @@ type InventoryRow = {
   id: string;
   asset_id: string;
   product_id: string;
-  brand_id: string | null;
   shop_id: string | null;
   bin_id: string | null;
   price: number;
@@ -84,7 +83,7 @@ bootstrapRouter.get("/bootstrap", (_req, res) => {
     id: p.id,
     sku: p.sku,
     strainId: p.strain_id,
-    name: p.name,
+    brandId: p.brand_id,
     type: p.type,
     kind: p.kind,
     createdAt: p.created_at,
@@ -94,7 +93,6 @@ bootstrapRouter.get("/bootstrap", (_req, res) => {
     id: i.id,
     assetId: i.asset_id,
     productId: i.product_id,
-    brandId: i.brand_id,
     shopId: i.shop_id,
     binId: i.bin_id,
     price: i.price,