liu an 31e229ff78 Docs: update for v0.19.0 (#7823) ... ### What problem does this PR solve? update for v0.19.0 ### Type of change - [x] Documentation Update		2025-05-23 18:18:58 +08:00
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best_practices
_category_.json	Restructured guides (#5555)	2025-03-03 17:13:37 +08:00
implement_deep_research.md
set_chat_variables.md
start_chat.md