chore: update Dockerfile.docs to remove openapi.json copy step

- Removed the step that copies openapi.json to the docs public folder, streamlining the Docker build process.
- Updated the documentation generation command to clarify the source of openapi.json.

Dockerfile.docs

@@ -11,11 +11,7 @@ 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 (needed for both generation and build)
-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
+# Generate OpenAPI documentation from apps/docs/public/openapi.json
 RUN pnpm --filter=./apps/docs run build:docs
 
 # Deploy only the dokploy app