Force Space rebuild v2.1.0 with incremental training

- Updated app version to 2.1.0 to force complete rebuild
- Added rebuild trigger file with timestamp
- Updated Docker environment variables
- Force restart to ensure all incremental training features are active
- Complete deployment of model retraining capabilities

Dockerfile

@@ -1,6 +1,6 @@
 FROM python:3.9-slim
 
-# Create a non-root user1
+# Create a non-root user
 RUN useradd --create-home --shell /bin/bash app
 
 # Set working directory