feat(easter-eggs): add easter egg hunt addon across all worlds

50 eggs hidden per child world (Jamie/Lyla/Mya) in 8 creative hiding
scenes (barrels, hay bales, flower patches, logs, fences, crafting
tables, mossy ledges, leaf clusters). Each world uses a distinct glazed
terracotta colour. Found eggs are tracked via player tags which persist
across server transfers; lobby reads tags and maintains a scoreboard
leaderboard (egg_count objective). Gitea deploy workflow updated to
include easter-egg-addon/ and docker-compose.yml in checkout.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -7,6 +7,7 @@ on:
       - 'addon/**'
       - 'lobby-addon/**'
       - 'hub-return-addon/**'
+      - 'easter-egg-addon/**'
       - 'docker-compose.yml'
       - 'scripts/**'
 
@@ -31,11 +32,11 @@ jobs:
               git init
               git remote add origin https://git.silverlabs.uk/SilverLABS/minecraft-aiworld.git
               git fetch origin main
-              git checkout -f origin/main -- addon/ lobby-addon/ hub-return-addon/
+              git checkout -f origin/main -- addon/ lobby-addon/ hub-return-addon/ easter-egg-addon/ docker-compose.yml
             else
               cd "$APP_DIR"
               git fetch origin main
-              git checkout -f origin/main -- addon/ lobby-addon/ hub-return-addon/
+              git checkout -f origin/main -- addon/ lobby-addon/ hub-return-addon/ easter-egg-addon/ docker-compose.yml
             fi
 
             # Restart all 4 Minecraft containers to pick up changes