fix: resolve volume name conflicts in restic stack

Prefixed all external volume references with 'backup_' to avoid
conflicts with volume definitions in other compose files (e.g.,
directus_uploads defined in both sexy and restic).

This allows Docker Compose's include pattern to work correctly
without volume name collisions.

restic/compose.yaml

@@ -15,19 +15,19 @@ services:
       - ${RESTIC_BACKUP_PATH:-/mnt/hidrive/users/valknar/Backup}:/repos
 
       # Docker volumes to backup (read-only)
-      - core_postgres_data:/volumes/core_postgres_data:ro
-      - core_redis_data:/volumes/core_redis_data:ro
-      - directus_uploads:/volumes/directus_uploads:ro
-      - directus_bundle:/volumes/directus_bundle:ro
-      - awesome_data:/volumes/awesome_data:ro
-      - gotify_data:/volumes/gotify_data:ro
-      - scrapyd_data:/volumes/scrapyd_data:ro
-      - scrapy_code:/volumes/scrapy_code:ro
-      - n8n_data:/volumes/n8n_data:ro
-      - filestash_data:/volumes/filestash_data:ro
-      - linkwarden_data:/volumes/linkwarden_data:ro
-      - linkwarden_meili_data:/volumes/linkwarden_meili_data:ro
-      - letsencrypt_data:/volumes/letsencrypt_data:ro
+      - backup_core_postgres_data:/volumes/core_postgres_data:ro
+      - backup_core_redis_data:/volumes/core_redis_data:ro
+      - backup_directus_uploads:/volumes/directus_uploads:ro
+      - backup_directus_bundle:/volumes/directus_bundle:ro
+      - backup_awesome_data:/volumes/awesome_data:ro
+      - backup_gotify_data:/volumes/gotify_data:ro
+      - backup_scrapyd_data:/volumes/scrapyd_data:ro
+      - backup_scrapy_code:/volumes/scrapy_code:ro
+      - backup_n8n_data:/volumes/n8n_data:ro
+      - backup_filestash_data:/volumes/filestash_data:ro
+      - backup_linkwarden_data:/volumes/linkwarden_data:ro
+      - backup_linkwarden_meili_data:/volumes/linkwarden_meili_data:ro
+      - backup_letsencrypt_data:/volumes/letsencrypt_data:ro
 
     environment:
       TZ: ${TIMEZONE:-Europe/Berlin}
@@ -65,43 +65,43 @@ volumes:
     name: ${RESTIC_COMPOSE_PROJECT_NAME}_tmp
 
   # External volumes from other stacks (read-only mounts)
-  core_postgres_data:
+  backup_core_postgres_data:
     name: core_postgres_data
     external: true
-  core_redis_data:
+  backup_core_redis_data:
     name: core_redis_data
     external: true
-  directus_uploads:
+  backup_directus_uploads:
     name: core_directus_uploads
     external: true
-  directus_bundle:
+  backup_directus_bundle:
     name: core_directus_bundle
     external: true
-  awesome_data:
+  backup_awesome_data:
     name: awesome_data
     external: true
-  gotify_data:
-    name: messaging_data
+  backup_gotify_data:
+    name: messaging_gotify_data
     external: true
-  scrapyd_data:
+  backup_scrapyd_data:
     name: scrapy_scrapyd_data
     external: true
-  scrapy_code:
+  backup_scrapy_code:
     name: scrapy_scrapy_code
     external: true
-  n8n_data:
+  backup_n8n_data:
     name: n8n_n8n_data
     external: true
-  filestash_data:
+  backup_filestash_data:
     name: stash_filestash_data
     external: true
-  linkwarden_data:
+  backup_linkwarden_data:
     name: links_data
     external: true
-  linkwarden_meili_data:
+  backup_linkwarden_meili_data:
     name: links_meili_data
     external: true
-  letsencrypt_data:
+  backup_letsencrypt_data:
     name: proxy_letsencrypt_data
     external: true