fix(cockpit): persist config and storage volumes per upstream docs

The template mounted `html:/var/www/html` (freezing the app code from the
first deploy) and `data:/var/www/html/storage/data`, which misses uploaded
assets (stored under `storage/uploads`) and cache. Per the official Cockpit
persistent-storage docs, mount `config:/var/www/html/config` and
`storage:/var/www/html/storage` instead.

Closes #549

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

blueprints/cockpit/docker-compose.yml

@@ -11,8 +11,8 @@ services:
       - COCKPIT_DATABASE_SERVER=mongodb://${MONGO_USERNAME}:${MONGO_PASSWORD}@mongo:27017
       - COCKPIT_DATABASE_NAME=cockpit
     volumes:
-      - html:/var/www/html
-      - data:/var/www/html/storage/data
+      - config:/var/www/html/config
+      - storage:/var/www/html/storage
     depends_on:
       - mongo
 
@@ -25,6 +25,6 @@ services:
       - mongo-data:/data/db
 
 volumes:
-  html:
-  data:
+  config:
+  storage:
   mongo-data: