refactor: Remove hardcoded production environment variables from Dockerfile

Dockerfile

@@ -18,8 +18,12 @@ WORKDIR /app
 # Copy installed packages from builder
 COPY --from=builder /install /usr/local
 
-# Production environment variables
-COPY .env /app/.env
+# Assume environment variables for DB config will be set at runtime
+# ENV DATABASE_HOST=your_db_host
+# ENV DATABASE_PORT=your_db_port
+# ENV DATABASE_NAME=your_db_name
+# ENV DATABASE_USER=your_db_user
+# ENV DATABASE_PASSWORD=your_db_password
 
 # Copy application code
 COPY . /app