Feat: Export Agent Logs. (#13658)

### What problem does this PR solve?
Feat: Export Agent Logs.

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: balibabu <assassin_cike@163.com>

api/apps/canvas_app.py

@@ -688,6 +688,8 @@ async def set_session(canvas_id):
     session_id=get_uuid()
     canvas = Canvas(cvs.dsl, tenant_id, canvas_id, canvas_id=cvs.id)
     canvas.reset()
+    # Get the version title for this canvas (using latest, not necessarily released)
+    version_title = UserCanvasVersionService.get_latest_version_title(cvs.id, release_mode=False)
     conv = {
         "id": session_id,
         "name": req.get("name", ""),
@@ -697,7 +699,8 @@ async def set_session(canvas_id):
         "message": [],
         "source": "agent",
         "dsl": cvs.dsl,
-        "reference": []
+        "reference": [],
+        "version_title": version_title
     }
     API4ConversationService.save(**conv)
     return get_json_result(data=conv)