fix(addons): bring silverlabs packs into schema compliance

- recipes: add unlock { context: always_unlocked } to all spark_pet and lobby_transfer recipes (1.20+ requirement) — fixes mc-lobby crash loop
- spark_dragon entity_sensor: wrap in subsensors[] and convert sensor_range → range [a,b] per 1.21 schema
- anthrax_cat interact: wrap event/filters in on_interact to match Bedrock 1.21 interact schema
- block format_version: bump mailbox and smart_crafting_table to 1.21.60
- item icons: replace { texture: X } with shorthand string form
- heyhe_egg description: replace bare category with menu_category block

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

smart-crafting-addon/smart_crafting_BP/blocks/smart_crafting_table.json

@@ -1,5 +1,5 @@
 {
-  "format_version": "1.21.0",
+  "format_version": "1.21.60",
   "minecraft:block": {
     "description": {
       "identifier": "silverlabs:smart_crafting_table",