Add WebRTC cross-region and replay repository MVP

[xiaoyaoqilan]

Summary

• add a source-runnable dimos webrtc-mvp CLI with local, publish, and subscribe commands
• publish timestamped synthetic frames through a strict H.264 WebRTC path
• report signaling, first-frame, P50/P95 latency, RTP loss, and sequence-gap metrics
• fail explicitly on ICE timeout, missing RTP frames, invalid frame stamps, or unavailable H.264 encoding
• add the foundational replay repository protocol and CLI for raw, manifest-based, and batch upload/download flows
• validate manifests and content hashes on both upload and download
• document local baseline and two-site hosted-SFU testing

Motivation

This is the transport and repository foundation for #3158. It validates WebRTC/SFU latency and first-frame behavior while providing the smallest usable artifact-sharing path before memory2, remote Go2 replay, object storage, regional selection, and production hardening are layered on top.

Validation

• targeted pytest suites for WebRTC metrics, replay repository behavior, and repository CLI passed
• ruff check and ruff format --check passed
• targeted mypy checks passed
• local H.264 WebRTC loopback: 46 decoded frames, 0 invalid timestamps, 0 sequence gaps, 0 packets lost, 82.31 ms media-to-first-frame, 72 ms P50, 87.75 ms P95
• Alibaba Cloud smoke test uploaded and hash-verified a real H.264 MP4 through the repository service

Follow-up stack

This is PR 1 of the #3158 implementation stack. Follow-ups add S3-compatible storage, memory2 integration, remote unitree-go2 replay, China/US node selection, and operational hardening.

[codecov]

Codecov Report

❌ Patch coverage is 70.05929% with 303 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	79.27%	59 Missing and 32 partials ⚠️
dimos/protocol/pubsub/impl/webrtc/mvp_metrics.py	88.46%	3 Missing and 3 partials ⚠️
...otocol/pubsub/impl/webrtc/replay_repository_cli.py	89.13%	4 Missing and 1 partial ⚠️
...otocol/pubsub/impl/webrtc/providers/video_track.py	42.85%	4 Missing ⚠️
...os/protocol/pubsub/impl/webrtc/providers/broker.py	83.33%	0 Missing and 1 partial ⚠️

@@            Coverage Diff             @@
##             main    #3177      +/-   ##
==========================================
+ Coverage   73.77%   73.96%   +0.18%     
==========================================
  Files        1109     1116       +7     
  Lines      104383   105389    +1006     
  Branches     9567     9658      +91     
==========================================
+ Hits        77013    77955     +942     
+ Misses      24695    24675      -20     
- Partials     2675     2759      +84     

Flag	Coverage Δ
OS-ubuntu-24.04-arm	67.74% <70.05%> (+0.03%)	⬆️
OS-ubuntu-latest	69.78% <70.05%> (+<0.01%)	⬆️
Py-3.10	69.77% <70.05%> (+<0.01%)	⬆️
Py-3.11	69.77% <70.05%> (+<0.01%)	⬆️
Py-3.12	69.77% <70.05%> (+<0.01%)	⬆️
Py-3.13	69.78% <70.05%> (+0.01%)	⬆️
Py-3.14	69.78% <70.05%> (+0.01%)	⬆️
Py-3.14t	69.78% <70.05%> (+0.01%)	⬆️

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

Files with missing lines	Coverage Δ
...os/protocol/pubsub/impl/webrtc/test_mvp_metrics.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)
dimos/robot/cli/dimos.py	69.04% <100.00%> (+0.64%)	⬆️
...os/protocol/pubsub/impl/webrtc/providers/broker.py	49.85% <83.33%> (+13.99%)	⬆️
...otocol/pubsub/impl/webrtc/providers/video_track.py	31.25% <42.85%> (+4.58%)	⬆️
...otocol/pubsub/impl/webrtc/replay_repository_cli.py	89.13% <89.13%> (ø)
dimos/protocol/pubsub/impl/webrtc/mvp_metrics.py	88.46% <88.46%> (ø)
...s/protocol/pubsub/impl/webrtc/replay_repository.py	79.27% <79.27%> (ø)
dimos/protocol/pubsub/impl/webrtc/mvp_cli.py	16.94% <16.94%> (ø)

... and 4 files with indirect coverage changes

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[xiaoyaoqilan]

it's not finish。

[xiaoyaoqilan]

我要做6个pr在这里：
仓储协议、CLI、批量传输、manifest。
对象存储后端：S3/R2/MinIO。
memory2 数据集索引和上传。
dimos --replay run unitree-go2 回放接入。
中美节点检测、健康检查和最优节点选择。
高可用、权限、TLS、CDN、监控、限额和故障恢复。

[autofix-ci]

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[xiaoyaoqilan]

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