refactor: Update Docker configurations for improved environment variable handling

- Changed the frontend Dockerfile to use process.env for environment variables instead of direct interpolation.
- Updated the production Docker Compose file to set environment variables directly instead of using build args.
- Switched the backend Dockerfile base image from `python:3.11-slim` to `python:alpine` for a smaller image size and increased worker count from 4 to 8 for better performance.

be/Dockerfile.prod

@@ -1,5 +1,5 @@
 # Multi-stage build for production
-FROM python:3.11-slim as base
+FROM python:alpine as base
 
 # Set environment variables
 ENV PYTHONDONTWRITEBYTECODE=1 \
@@ -58,7 +58,6 @@ EXPOSE 8000
 CMD ["uvicorn", "app.main:app", \
     "--host", "0.0.0.0", \
     "--port", "8000", \
-    "--workers", "4", \
+    "--workers", "8", \
-    "--worker-class", "uvicorn.workers.UvicornWorker", \
     "--access-log", \
     "--log-level", "info"] 

docker-compose.prod.yml

@@ -66,7 +66,7 @@ services:
       context: ./fe
       dockerfile: Dockerfile.prod
       target: production
-      args:
+    environment:
       - VITE_API_URL=${VITE_API_URL}
       - VITE_SENTRY_DSN=${VITE_SENTRY_DSN}
     ports:

fe/Dockerfile.prod

@@ -53,9 +53,9 @@ RUN echo '{ \n  "rewrites": [ \n    { "source": "**", "destination": "/index.htm
 RUN echo '#!/bin/sh\n\
 cat > /app/env-config.js << EOL\n\
 window.ENV = {\n\
-  VITE_API_URL: "${VITE_API_URL}",\n\
+  VITE_API_URL: process.env.VITE_API_URL,\n\
-  VITE_SENTRY_DSN: "${VITE_SENTRY_DSN}",\n\
+  VITE_SENTRY_DSN: process.env.VITE_SENTRY_DSN,\n\
-  VITE_ROUTER_MODE: "${VITE_ROUTER_MODE}"\n\
+  VITE_ROUTER_MODE: process.env.VITE_ROUTER_MODE\n\
 };\n\
 EOL\n\
 serve -s . -l 3000' > /app/start.sh && chmod +x /app/start.sh