fix(llm): bind llama-swap config from absolute /config/llm (Portainer rel-bind)

Portainer's git checkout auto-creates a relative repo-file bind as a directory,
breaking the /app/config.yaml mount. Use the absolute host path like the share
stack; repo copy stays canonical, mirrored to /config/llm on deploy.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

stacks/llm/docker-compose.yml

@@ -25,7 +25,11 @@ services:
       - "nvidia.com/gpu=0"
     volumes:
       - /storage1/labdata/llm/models:/models
-      - ./llama-swap-config.yaml:/app/config.yaml:ro
+      # Live config is host-managed at /config/llm (Portainer git checkout won't
+      # materialize a relative repo-file bind — it auto-creates a dir). The repo
+      # copy stacks/llm/llama-swap-config.yaml is canonical; on change, copy it to
+      # /config/llm/llama-swap-config.yaml on valhalla (see homelab-apply).
+      - /config/llm/llama-swap-config.yaml:/app/config.yaml:ro
     ports:
       - "172.20.0.1:8090:8080"
     healthcheck: