Add S3-compatible replay object storage

[xiaoyaoqilan]

Summary

• add an S3-compatible backend for replay artifacts
• support AWS S3, Cloudflare R2, MinIO, and compatible object stores through configurable endpoints and credentials
• preserve content-addressed object IDs and manifest/hash validation
• keep the filesystem backend available for local development and small deployments

Motivation

This is PR 2 of the #3158 implementation stack. It separates durable cloud object storage from the WebRTC live media path and provides a migration path beyond a single server disk.

Stack dependency

• depends on Add WebRTC cross-region and replay repository MVP #3177
• review the commits after dca83a5 for the isolated change

Validation

• targeted object-storage and replay repository tests passed
• ruff check and ruff format --check passed
• targeted mypy checks passed

[autofix-ci]

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[codecov]

Codecov Report

❌ Patch coverage is 73.51562% with 339 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	79.55%	59 Missing and 32 partials ⚠️
...rotocol/pubsub/impl/webrtc/replay_repository_s3.py	74.64%	23 Missing and 13 partials ⚠️
...otocol/pubsub/impl/webrtc/replay_repository_cli.py	87.03%	5 Missing and 2 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 ⚠️
dimos/robot/cli/dimos.py	0.00%	1 Missing ⚠️

@@            Coverage Diff             @@
##             main    #3184      +/-   ##
==========================================
- Coverage   73.77%   71.17%   -2.61%     
==========================================
  Files        1109     1119      +10     
  Lines      104383   107201    +2818     
  Branches     9567    10075     +508     
==========================================
- Hits        77013    76301     -712     
- Misses      24695    28247    +3552     
+ Partials     2675     2653      -22     

Flag	Coverage Δ
OS-ubuntu-24.04-arm	68.06% <73.51%> (+0.36%)	⬆️
OS-ubuntu-latest	?
Py-3.10	?
Py-3.11	?
Py-3.12	?
Py-3.13	?
Py-3.14	68.06% <73.51%> (-1.71%)	⬇️
Py-3.14t	?

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

Files with missing lines	Coverage Δ
...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)
...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)
dimos/robot/cli/dimos.py	60.24% <0.00%> (-8.16%)	⬇️
...os/protocol/pubsub/impl/webrtc/providers/broker.py	34.31% <80.00%> (-1.55%)	⬇️
dimos/protocol/pubsub/impl/webrtc/mvp_metrics.py	88.46% <88.46%> (ø)
...otocol/pubsub/impl/webrtc/replay_repository_cli.py	87.03% <87.03%> (ø)
...rotocol/pubsub/impl/webrtc/replay_repository_s3.py	74.64% <74.64%> (ø)
... and 2 more

... and 58 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.