Group bins by letter, sort by number, drop location

Bins follow an A1/A2/B1 naming convention, so the Bins page now parses
the leading letter prefix as a row group and the trailing number as the
within-row order. Each letter starts a fresh grid section; bins whose
names don't match the pattern fall into a trailing "Other" bucket
sorted alphabetically.

Removes the optional location field from bins end to end: the API
client signatures, server POST/PATCH routes, both product-flow inline
creates, the dropdown labels, the ProductDetail bin row, and the
BinsView header line. The bootstrap query explicitly projects only
id/name/capacity so the dead column doesn't leak through.

The location column stays in the bins table on disk to avoid a
migration on existing deployments — it just isn't read or written.

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

web/src/api.ts

@@ -108,20 +108,17 @@ export const api = {
   deleteShop: (id: string) =>
     request<{ ok: true }>(`/shops/${id}`, { method: "DELETE" }),
 
-  createBin: (body: { name: string; location?: string; capacity?: number }) =>
-    request<{ id: string; name: string; location: string | null; capacity: number }>("/bins", {
+  createBin: (body: { name: string; capacity?: number }) =>
+    request<{ id: string; name: string; capacity: number }>("/bins", {
       method: "POST",
       body: JSON.stringify(body),
     }),
 
-  updateBin: (
-    id: string,
-    body: { name?: string; location?: string | null; capacity?: number },
-  ) =>
-    request<{ id: string; name: string; location: string | null; capacity: number }>(
-      `/bins/${id}`,
-      { method: "PATCH", body: JSON.stringify(body) },
-    ),
+  updateBin: (id: string, body: { name?: string; capacity?: number }) =>
+    request<{ id: string; name: string; capacity: number }>(`/bins/${id}`, {
+      method: "PATCH",
+      body: JSON.stringify(body),
+    }),
 
   deleteBin: (id: string) =>
     request<{ ok: true }>(`/bins/${id}`, { method: "DELETE" }),