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>

lobby-addon/lobby_transfer_BP/recipes/portal_frame.json

@@ -4,6 +4,7 @@
     "description": {
       "identifier": "silverlabs:portal_frame_recipe"
     },
+    "unlock": { "context": "always_unlocked" },
     "tags": ["crafting_table"],
     "pattern": [
       " O ",

lobby-addon/lobby_transfer_BP/recipes/portal_jamie.json

@@ -4,6 +4,7 @@
     "description": {
       "identifier": "silverlabs:portal_jamie_recipe"
     },
+    "unlock": { "context": "always_unlocked" },
     "tags": ["crafting_table"],
     "ingredients": [
       { "item": "silverlabs:portal_frame" },

lobby-addon/lobby_transfer_BP/recipes/portal_lyla.json

@@ -4,6 +4,7 @@
     "description": {
       "identifier": "silverlabs:portal_lyla_recipe"
     },
+    "unlock": { "context": "always_unlocked" },
     "tags": ["crafting_table"],
     "ingredients": [
       { "item": "silverlabs:portal_frame" },

lobby-addon/lobby_transfer_BP/recipes/portal_mya.json

@@ -4,6 +4,7 @@
     "description": {
       "identifier": "silverlabs:portal_mya_recipe"
     },
+    "unlock": { "context": "always_unlocked" },
     "tags": ["crafting_table"],
     "ingredients": [
       { "item": "silverlabs:portal_frame" },