docs: update Jaeger and DTS dashboard screenshots

Updated all screenshots to reflect the latest span durations:
- Timer spans now show creation-to-fired duration (~965ms)
- Activity client spans show scheduling-to-completion duration (~184ms)
- Activity server spans show execution duration (~25ms)
- Orchestration span covers full lifecycle (~1.23s)
- 15 total spans in a clean, coherent trace

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: torosent