fix: update Playwright cache path in build info output

- Change build log check from /root/.cache/ms-playwright to /opt/ms-playwright
- Ensures build output correctly shows pre-installed Chromium browsers
- Prevents misleading "(not found)" messages in CI logs

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Author: WUHINS

docker/Dockerfile.full

@@ -225,7 +225,7 @@ RUN echo "========================================" && \
     echo "UV version: $(uv --version)" && \
     echo "Nginx version: $(nginx -v 2>&1)" && \
     echo "Playwright browsers:" && \
-    ls -la /root/.cache/ms-playwright/ 2>/dev/null || echo "  (not found)" && \
+    ls -la /opt/ms-playwright/ 2>/dev/null || echo "  (not found)" && \
     echo "========================================"
 
 # 15. Set entrypoint