https://www.pcsfc.com/ai-api.html 2026-06-27 0.6 https://www.pcsfc.com/docs/ 2026-06-27 0.5 https://www.pcsfc.com/docs/llms.txt 2026-06-27 0.5 https://www.pcsfc.com/docs/openapi/liyu_ai_openapi_preview_schema_candidate_20260528.yaml 2026-06-27 0.5