Fix embedded association count calls for Mongoid 8

Author: Kit (OpenClaw)

notes/WA-VERIFY-089-mongoid8-embedded-count.md

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+# WA-VERIFY-089 / #1080 - Embedded association `.count` (Mongoid 8)
+
+Mongoid 8 changed embedded association `.count` to always hit the database.
+This can introduce unnecessary queries (and N+1s) when the embedded documents
+are already loaded in memory.
+
+## Changes
+
+Replaced embedded-association `.count` calls with `.size`:
+
+- `Workarea::OrdersSeeds`:
+  - `user.addresses.count` → `user.addresses.size`
+- Admin category index:
+  - `result.product_rules.count` → `result.product_rules.size`
+- Admin variants index:
+  - `@variants.count` → `@variants.size`
+
+## Intentionally unchanged
+
+- `.count` calls on Mongoid criteria/relations (non-embedded) where a database
+  count is expected.
+- `.count` on Ruby collections where it is purely in-memory (e.g. arrays/hashes,
+  or `Enumerable#count { ... }`).