feat: add slot machine artwork and update game registry

- Add new slot machine themes: Pharaoh's Fortune and Abyssal Treasures
  - 10 symbols each with corresponding PNG assets
  - Cabinet artwork for both themes
- Update slots-artwork.json with image paths for all new symbols
- Reformat registerGame calls in registry.js for consistency
- Update slots iconFrame from 54 to 63

Adds complete artwork and configuration for two new slot machine themes,
bringing the total registered games to 63.

public/data/slots-artwork.json

@@ -144,17 +144,17 @@
     {
       "id": "pharaohs-fortune-ankh",
       "key": "slots-pharaohs-fortune-ankh",
-      "path": null
+      "path": "/assets/images/slots/pharaohs-fortune/ankh.png"
     },
     {
       "id": "pharaohs-fortune-eye",
       "key": "slots-pharaohs-fortune-eye",
-      "path": null
+      "path": "/assets/images/slots/pharaohs-fortune/eye.png"
     },
     {
       "id": "pharaohs-fortune-cat",
       "key": "slots-pharaohs-fortune-cat",
-      "path": null
+      "path": "/assets/images/slots/pharaohs-fortune/cat.png"
     },
     {
       "id": "pharaohs-fortune-ace",
@@ -179,22 +179,22 @@
     {
       "id": "pharaohs-fortune-sphinx",
       "key": "slots-pharaohs-fortune-sphinx",
-      "path": null
+      "path": "/assets/images/slots/pharaohs-fortune/sphinx.png"
     },
     {
       "id": "pharaohs-fortune-pyramid",
       "key": "slots-pharaohs-fortune-pyramid",
-      "path": null
+      "path": "/assets/images/slots/pharaohs-fortune/pyramid.png"
     },
     {
       "id": "pharaohs-fortune-pharaoh",
       "key": "slots-pharaohs-fortune-pharaoh",
-      "path": null
+      "path": "/assets/images/slots/pharaohs-fortune/pharaoh.png"
     },
     {
       "id": "pharaohs-fortune-cabinet",
       "key": "slots-pharaohs-fortune-cabinet",
-      "path": null
+      "path": "/assets/images/slots/slots-pharaohs-fortune-cabinet.png"
     },
     {
       "id": "pharaohs-fortune-card",
@@ -204,52 +204,52 @@
     {
       "id": "abyssal-treasures-bubble",
       "key": "slots-abyssal-treasures-bubble",
-      "path": null
+      "path": "/assets/images/slots/abyssal-treasures/bubble.png"
     },
     {
       "id": "abyssal-treasures-octopus",
       "key": "slots-abyssal-treasures-octopus",
-      "path": null
+      "path": "/assets/images/slots/abyssal-treasures/octopus.png"
     },
     {
       "id": "abyssal-treasures-coral",
       "key": "slots-abyssal-treasures-coral",
-      "path": null
+      "path": "/assets/images/slots/abyssal-treasures/coral.png"
     },
     {
       "id": "abyssal-treasures-seahorse",
       "key": "slots-abyssal-treasures-seahorse",
-      "path": null
+      "path": "/assets/images/slots/abyssal-treasures/seahorse.png"
     },
     {
       "id": "abyssal-treasures-starfish",
       "key": "slots-abyssal-treasures-starfish",
-      "path": null
+      "path": "/assets/images/slots/abyssal-treasures/starfish.png"
     },
     {
       "id": "abyssal-treasures-shell",
       "key": "slots-abyssal-treasures-shell",
-      "path": null
+      "path": "/assets/images/slots/abyssal-treasures/seashell.png"
     },
     {
       "id": "abyssal-treasures-angler",
       "key": "slots-abyssal-treasures-angler",
-      "path": null
+      "path": "/assets/images/slots/abyssal-treasures/angler.png"
     },
     {
       "id": "abyssal-treasures-mermaid",
       "key": "slots-abyssal-treasures-mermaid",
-      "path": null
+      "path": "/assets/images/slots/abyssal-treasures/mermaid.png"
     },
     {
       "id": "abyssal-treasures-pearl",
       "key": "slots-abyssal-treasures-pearl",
-      "path": null
+      "path": "/assets/images/slots/abyssal-treasures/pearl.png"
     },
     {
       "id": "abyssal-treasures-cabinet",
       "key": "slots-abyssal-treasures-cabinet",
-      "path": null
+      "path": "/assets/images/slots/slots-abyssal-treasures-cabinet.png"
     },
     {
       "id": "abyssal-treasures-card",

server/games/registry.js

@@ -87,4 +87,4 @@ registerGame({ slug: 'jewelquest',        name: 'Jewel Quest',       category: '
 registerGame({ slug: 'zuma', name: 'Zuma', category: 'logic', minPlayers: 1, maxPlayers: 1, minOpponents: 0, maxOpponents: 0, iconFrame: 60 });
 registerGame({ slug: 'bejeweled', name: 'Bejeweled Blitz', category: 'logic', minPlayers: 1, maxPlayers: 1, minOpponents: 0, maxOpponents: 0, iconFrame: 61 });
 registerGame({ slug: 'minimotorways', name: 'Mini Motorways', category: 'logic', minPlayers: 1, maxPlayers: 1, minOpponents: 0, maxOpponents: 0, iconFrame: 62 });
-registerGame({ slug: 'slots',             name: 'Slot Machines',     category: 'casino',   minPlayers: 1, maxPlayers: 1, minOpponents: 0, maxOpponents: 0, iconFrame: 54 });
+registerGame({ slug: 'slots', name: 'Slot Machines', category: 'casino', minPlayers: 1, maxPlayers: 1, minOpponents: 0, maxOpponents: 0, iconFrame: 63 });