fix(docker): make Excel lookup file optional in docker-compose

- Comment out Excel file volume mount by default
- Excel lookup will be disabled if file not present
- Prevents deployment error when file doesn't exist
- Users can uncomment the line if they have the Excel file

Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>

docker-compose.fastapi.yml

@@ -84,14 +84,8 @@ services:
       - ./backend/data:/app/data
       # Persistent templates
       - ./backend/output:/app/output
-      # Copy existing Excel lookup file (if exists)
-      - type: bind
-        source: ./Celum ID to Adobe Asset Path Mapping Spreadsheet (1).xlsx
-        target: /app/Celum ID to Adobe Asset Path Mapping Spreadsheet (1).xlsx
-        read_only: true
-        # Optional - won't fail if file doesn't exist
-        bind:
-          create_host_path: false
+      # Excel lookup file (optional - comment out if file doesn't exist)
+      # - ./Celum ID to Adobe Asset Path Mapping Spreadsheet (1).xlsx:/app/Celum ID to Adobe Asset Path Mapping Spreadsheet (1).xlsx:ro
 
     ports:
       - "${BACKEND_PORT:-5001}:8000"