fix: remove all Streamlit references, replace with Reflex

[DeepRatAI]

Summary

Closes #3

Removes all residual Streamlit references from the codebase. MedeX migrated to Reflex in v1.0.0 but several configuration files still referenced Streamlit.

Changes

requirements.txt

• Removed streamlit>=1.28.0 and streamlit-chat>=0.1.1
• Updated header comment to reference Reflex UI framework

pyproject.toml

• Removed "streamlit" from keywords
• Removed "streamlit>=1.28.0" from dependencies
• Added "reflex" to keywords

Dockerfile

• Stage 4 (UI): Changed from Streamlit CMD to Reflex (reflex run --env prod), port 8501→3000
• Stage 5 (HuggingFace): Same Streamlit→Reflex migration
• Production stage: Updated EXPOSE to 8000+3000, MEDEX_UI_PORT=3000

docker-compose.yml

• Updated UI service: port 3000, MEDEX_UI_FRAMEWORK=reflex, healthcheck endpoint
• Updated HuggingFace service: Reflex env vars

Verification

grep -rin "streamlit\|8501" requirements.txt pyproject.toml Dockerfile docker-compose.yml
# Exit code 1 — zero matches

Checklist

• No Streamlit references remain in modified files
• Port mappings updated (8501→3000)
• Environment variables updated
• Docker healthchecks updated
• Keywords/dependencies reflect Reflex