fix(addons): populate recipe unlock with crafting_table ingredient

Bedrock 1.26 rejects { context } variants as "malformed unlocking context"
and [] as "empty unlocking ingredient array". The unlock field must contain
at least one ingredient item; players who have that item unlock the recipe.

Using minecraft:crafting_table as the unlock ingredient makes semantic sense
(all 26 recipes already require the crafting_table tag) and effectively means
"visible once the player has any crafting table".

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

addon/spark_pet_BP/recipes/dragon_nest_obsidian.json

@@ -4,7 +4,11 @@
     "description": {
       "identifier": "silverlabs:dragon_nest_obsidian_recipe"
     },
-    "unlock": [],
+    "unlock": [
+      {
+        "item": "minecraft:crafting_table"
+      }
+    ],
     "tags": [
       "crafting_table"
     ],