Disable DEMO_MODE to use real MedGemma model (Requires GPU)

Dockerfile

@@ -20,7 +20,7 @@ WORKDIR /app
 # -- Environment Configuration --
 # DEMO_MODE=true uses simulated MST-aware responses (no model loading required)
 # For production/GPU, set DEMO_MODE=false to load actual MedGemma model
-ENV DEMO_MODE="true"
+ENV DEMO_MODE="false"
 ENV LOCAL_MODEL_PATH="NurseCitizenDeveloper/ewaast-medgemma-1.5-4b"
 ENV USE_LOCAL_MODEL="true"
 ENV FLASK_ENV="production"