Add store settings page with location management

Company table gains address and logo_file_id columns. New store
settings API: GET/PATCH /store for company info, full CRUD for
/locations. Settings page shows store name, phone, email, address,
timezone with inline edit. Location cards with add/edit/delete.
Settings link in admin sidebar. Fixes leftover company_id on
location table and seed files.

packages/backend/src/db/migrations/meta/_journal.json

@@ -162,6 +162,13 @@
       "when": 1774820000000,
       "tag": "0022_shared_file_storage",
       "breakpoints": true
+    },
+    {
+      "idx": 23,
+      "version": "7",
+      "when": 1774830000000,
+      "tag": "0023_store_settings",
+      "breakpoints": true
     }
   ]
 }