Select healthy China and US replay nodes

[xiaoyaoqilan]

Summary

• expose replay node health and region metadata through /healthz
• probe configured China and US endpoints concurrently
• select the fastest healthy node for upload/download
• cache the recommendation for one hour, then automatically re-evaluate the network environment
• integrate automatic server selection into the replay repository CLI

Motivation

This is PR 5 of the #3158 implementation stack. It implements regional auto-detection and hourly dynamic upload recommendations without hard-coding a single China or US endpoint.

Stack dependency

• depends on Resolve remote memory2 replays for Go2 #3186, Add indexed memory2 replay uploads #3185, Add S3-compatible replay object storage #3184, and Add WebRTC cross-region and replay repository MVP #3177
• review the commit after aee1f2f for the isolated change

Validation

• node health, concurrent probe, latency ordering, failure fallback, and one-hour cache behavior are covered by tests
• ruff check, format checks, and targeted mypy passed

[autofix-ci]

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[codecov]

Codecov Report

❌ Patch coverage is 78.81269% with 414 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
dimos/protocol/pubsub/impl/webrtc/mvp_cli.py	16.94%	195 Missing and 1 partial ⚠️
...s/protocol/pubsub/impl/webrtc/replay_repository.py	79.42%	60 Missing and 33 partials ⚠️
...rotocol/pubsub/impl/webrtc/replay_repository_s3.py	74.64%	23 Missing and 13 partials ⚠️
dimos/protocol/pubsub/impl/webrtc/replay_nodes.py	76.19%	19 Missing and 16 partials ⚠️
dimos/memory2/remote_replay.py	79.46%	15 Missing and 8 partials ⚠️
dimos/memory2/remote_dataset.py	87.36%	6 Missing and 6 partials ⚠️
...otocol/pubsub/impl/webrtc/replay_repository_cli.py	85.93%	6 Missing and 3 partials ⚠️
dimos/protocol/pubsub/impl/webrtc/mvp_metrics.py	88.46%	3 Missing and 3 partials ⚠️
...os/protocol/pubsub/impl/webrtc/providers/broker.py	80.00%	1 Missing and 1 partial ⚠️
.../pubsub/impl/webrtc/test_memory2_remote_dataset.py	98.97%	1 Missing ⚠️
... and 1 more

@@            Coverage Diff             @@
##             main    #3187      +/-   ##
==========================================
- Coverage   73.77%   73.68%   -0.10%     
==========================================
  Files        1109     1125      +16     
  Lines      104383   107873    +3490     
  Branches     9567    10127     +560     
==========================================
+ Hits        77013    79486    +2473     
- Misses      24695    25583     +888     
- Partials     2675     2804     +129     

Flag	Coverage Δ
OS-ubuntu-24.04-arm	68.19% <78.81%> (+0.49%)	⬆️
OS-ubuntu-latest	70.21% <78.81%> (+0.44%)	⬆️
Py-3.10	70.21% <78.81%> (+0.44%)	⬆️
Py-3.11	70.21% <78.81%> (+0.44%)	⬆️
Py-3.12	70.20% <78.81%> (+0.43%)	⬆️
Py-3.13	70.20% <78.81%> (+0.43%)	⬆️
Py-3.14	68.19% <78.81%> (-1.58%)	⬇️
Py-3.14t	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
dimos/core/global_config.py	88.63% <100.00%> (+5.68%)	⬆️
dimos/core/test_global_config.py	100.00% <100.00%> (ø)
dimos/memory2/cli/app.py	84.21% <100.00%> (+14.21%)	⬆️
...otocol/pubsub/impl/webrtc/providers/video_track.py	24.39% <ø> (-2.28%)	⬇️
...os/protocol/pubsub/impl/webrtc/test_mvp_metrics.py	100.00% <100.00%> (ø)
.../protocol/pubsub/impl/webrtc/test_remote_replay.py	100.00% <100.00%> (ø)
...s/protocol/pubsub/impl/webrtc/test_replay_nodes.py	100.00% <100.00%> (ø)
...tocol/pubsub/impl/webrtc/test_replay_repository.py	100.00% <100.00%> (ø)
...l/pubsub/impl/webrtc/test_replay_repository_cli.py	100.00% <100.00%> (ø)
...ol/pubsub/impl/webrtc/test_replay_repository_s3.py	100.00% <100.00%> (ø)
... and 12 more

... and 30 files with indirect coverage changes

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[xiaoyaoqilan]

Superseded by #3201. The implementation is consolidated into the dimos/hosted_data package and unified dimos data CLI.