fix: copy patches/ directory in Dockerfile fe-builder stage (#3301)

pnpm requires patch files referenced in pnpm-lock.yaml to be present
during install. The patches/ dir was not copied, causing the build to
fail with ENOENT on @pierre__diffs@1.1.4.patch.

Fixes #3300

Co-authored-by: Claude Code <claude@anthropic.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: NguyenMinh1912

crates/remote/Dockerfile

@@ -19,6 +19,7 @@ COPY packages/local-web/package.json packages/local-web/package.json
 COPY packages/remote-web/package.json packages/remote-web/package.json
 COPY packages/ui/package.json packages/ui/package.json
 COPY packages/web-core/package.json packages/web-core/package.json
+COPY patches/ patches/
 
 RUN --mount=type=cache,id=pnpm,target=/pnpm/store \
     pnpm install --frozen-lockfile