tandoor: 1.5.26 -> 2.6.13 [MAJOR]

Campaign 7 catalog sweep.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Nn3VgQk9iwEGgyx6QJ2NvE

templates/tandoor/docker-compose.yml

@@ -10,7 +10,7 @@
 
 services:
   tandoor:
-    image: ghcr.io/tandoorrecipes/recipes:1.5.26
+    image: ghcr.io/tandoorrecipes/recipes:2.6.13
     container_name: tandoor
     restart: unless-stopped
     depends_on: