fix: config.json lives in data dir, not bind-mounted as file

Removes the separate config.json file bind mount from both compose
files. The data directory mount already covers it, and the Go server
searches /app/data/config.json via LoadConfig.

- Entrypoint symlinks /app/data/config.json for ingestor compatibility
- manage.sh setup creates config in data dir, prompts admin if missing
- manage.sh start checks config exists before starting, offers to create
- deploy.yml simplified — no more sudo rm or directory cleanup
- Backup/restore updated to use data dir path

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/workflows/deploy.yml

@@ -264,8 +264,7 @@ jobs:
 
       - name: Deploy staging
         run: |
-          # Use docker compose down (not just stop/rm) to properly clean up
-          # the old container, network, and release memory before starting new one
+          # Stop old container and release memory
           docker compose -f "$STAGING_COMPOSE_FILE" -p corescope-staging down --timeout 30 2>/dev/null || true
 
           # Wait for container to be fully gone and OS to reclaim memory (3GB limit)
@@ -277,14 +276,14 @@ jobs:
           done
           sleep 5  # extra pause for OS memory reclaim
 
-          # Ensure staging config exists (docker creates a directory if bind mount source missing)
+          # Ensure staging data dir exists (config.json lives here, no separate file mount)
           STAGING_DATA="${STAGING_DATA_DIR:-$HOME/meshcore-staging-data}"
           mkdir -p "$STAGING_DATA"
-          # Remove directory-masquerading-as-file left by failed docker mount
-          [ -d "$STAGING_DATA/config.json" ] && rm -rf "$STAGING_DATA/config.json"
+
+          # If no config exists, copy the example (CI doesn't have a real prod config)
           if [ ! -f "$STAGING_DATA/config.json" ]; then
-            echo "Staging config missing — copying from repo config.json"
-            cp config.json "$STAGING_DATA/config.json" 2>/dev/null || cp config.example.json "$STAGING_DATA/config.json"
+            echo "Staging config missing — copying config.example.json"
+            cp config.example.json "$STAGING_DATA/config.json" 2>/dev/null || true
           fi
 
           docker compose -f "$STAGING_COMPOSE_FILE" -p corescope-staging up -d staging-go