Merge remote-tracking branch 'origin/master' into ji

# Conflicts:
#	frontend-web/src/components/workspace/input-box.tsx
#	offline-backend-20260512/backend/CLAUDE.md

offline-backend-20260512/backend/app/gateway/app.py

@@ -981,6 +981,18 @@ async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
                 # re-run the heavy sync even though we just did it.
                 _services_mark_sync_fresh()
                 logger.info("Legacy folder-backed agents synced at startup")
+                # 内置功能型 agent(roundtable-* / ai-writing-*)按用途默认打标签,
+                # 供管理员「内置智能体」筛选按用途归类。幂等、只追加、失败不阻塞启动。
+                try:
+                    from app.gateway.routers._builtin_agent_tag_seed import (
+                        ensure_builtin_agent_purpose_tags,
+                    )
+
+                    tag_store = getattr(app.state, "tag_store", None)
+                    if tag_store is not None:
+                        await ensure_builtin_agent_purpose_tags(agent_store, tag_store)
+                except Exception:
+                    logger.exception("Built-in agent purpose-tag seeding failed at startup (non-fatal)")
         except Exception:
             logger.exception("Legacy agent sync failed at startup (non-fatal)")