fix(fifa17): send a club item's real wire assetId, not its carddbid

A club item's `assetId` (record +0x20) is family specific and is NOT the
carddbid: per the client's own tables a kit carries the art class from
fcc_kitcards.assetid - 14 for the 63xxxxx home/third band, 15 for the 64xxxxx
away band - a badge carries its team id, and a ball and stadium their own
asset number. The catalog shipped `asset_id`, the carddbid, in that slot.

Measured on the live client with both kits resident: record +0x20 held
6300006 (home) and 6400003 (away) where the table says 14 and 15, while every
other field - resourceId, cardassetid 35, category 2/3, teamid 21, year 0,
itemState 101/102 - already matched. Operator reports both pre-match kit tiles
rendering identically. assetId is the only field that diverges from the
client's own data, and an assetId that is not a valid kit art class cannot
resolve to distinct art.

`resource_id` is derived from `asset_id`, and every home kit shares art class
14, so the two cannot be the same field: catalogs now carry an optional
`club_asset_id`, defaulting to `asset_id` so a catalog predating the field and
every non-club kind are unchanged. resolve_kit emits it as the wire `assetId`.

Fixed at the source too - scripts/sold-staging-up.py emitted asset_id as the
wire assetId for all four club families, so a re-emit would have regressed it.

Field-offset note: club_items.json's _record_map is authoritative and my
earlier working note had these transposed - assetId is +0x20 and cardassetid
is +0x1c, not the reverse.

Adds tools/live/diff_kit_records.py, which byte-diffs the two resident kit
records and names the fields the decoded clone query consumes.

Staging wire now reads assetId 14/15 with cardassetid 35 on both
squad.actives and /club?type=equippables. Workspace 1250 passed, 0 failed.
Client re-parse still to be confirmed visually.

openfut-utas-host/src/lib.rs

@@ -2128,7 +2128,9 @@ impl ItemIdentityResolver for Fifa17IdentityResolver {
         }
         Some(Fifa17KitIdentity {
             item_id: self.wire_for(item)?,
-            asset_id: ident.asset_id,
+            // The club-item wire `assetId` is family specific and is NOT the
+            // carddbid — see `Fifa17CardIdentity::club_asset_id`.
+            asset_id: ident.club_asset_id,
             resource_id: ident.resource_id,
             card_asset_id: ident.card_asset_id,
             subtype: ident.subtype,