chore: remove openapi.json copy step from Dockerfile.docs

- Eliminated the step that copied openapi.json to the docs public folder to streamline the Docker build process.
- This change aligns with recent documentation cleanup efforts and avoids redundancy in file management.

Dockerfile.docs

@@ -11,10 +11,6 @@ WORKDIR /usr/src/app
 # Install dependencies
 RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --filter=./apps/docs --frozen-lockfile
 
-# Copy openapi.json to docs public folder
-RUN mkdir -p /usr/src/app/apps/docs/public && \
-    cp /usr/src/app/public/openapi.json /usr/src/app/apps/docs/public/openapi.json
-
 # Generate OpenAPI documentation
 RUN pnpm --filter=./apps/docs run build:docs