增强 Deep Research 可靠性，并接入 8BF 任务卡片与会商上下文。

修复 MySQL 读写分离下的持久化与 SSE 重连问题，报告完成前先落库；8BF 嵌入页支持 taskId 任务卡与独立意图 metadata；前端统一 createClientId 并更新 runtime 配置。

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -93,6 +93,12 @@ offline-backend-20260512/backend/tests/*
 # Keep the model configuration regression coverage versioned even though
 # this deployment repository otherwise ignores newly added backend tests.
 !offline-backend-20260512/backend/tests/test_model_management.py
+# Deep-research reliability regression coverage.
+!offline-backend-20260512/backend/tests/test_deep_research_persistence.py
+!offline-backend-20260512/backend/tests/test_deep_research_event_sink.py
+!offline-backend-20260512/backend/tests/test_deep_research_executor_reliability.py
+!offline-backend-20260512/backend/tests/test_deep_research_start_job.py
+!offline-backend-20260512/backend/tests/test_summarization_human_message.py
 deploy
 .history