feat(snapshot): add PageBroker Unix socket server

[dfeigin-nv]

Adds the PageBroker Unix-socket daemon. It accepts one framed protobuf request per connection and rejects malformed or oversized frames.

Validation: make -C deploy/snapshot/pagebroker daemon test and git diff --check pagebroker-nsmount...pagebroker-daemon-server.

[devin-ai-integration]

Devin Review found 2 potential issues.

View 1 additional finding in Devin Review.

[github-actions]

🌿 Fern Docs Preview: https://nvidia-preview-01a00ac6-876d-775c-87c3-6d07c1dd210f.docs.buildwithfern.com/dynamo/dev

[datadog-official]

 

⚠️ Warnings

🚦 3 Pipeline jobs failed

Pre Merge | pre-commit     

🔧 Fix in code. This looks caused by changes in this PR.

Detected changes made by pre-commit hooks in 'deploy/snapshot/pagebroker/v1/pagebroker.proto'.

Docs link check | lychee     

See error

Multiple 404 errors encountered while accessing API documentation URLs during execution.

Pre Merge | pre-merge-status-check     

📋 Copy prompt for your agent

CI on my pull request is failing. Help me find and fix the root cause of each failing job below — they were flagged as caused by changes in this PR, so focus on the diff. For each job, explain the failure and propose a fix.

Branch: pagebroker-daemon-server

Pre Merge | pre-commit
Commit: 9bd84414b8c11bde5578585c2f0f59f018fa7cbf
Error (code / build):
Detected changes made by pre-commit hooks in 'deploy/snapshot/pagebroker/v1/pagebroker.proto'.
CI job: https://github.com/ai-dynamo/dynamo/actions/runs/31950946132/job/95174263193

ℹ️ Info

🔄 Datadog auto-retried 2 jobs - 2 passed on retry

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 51.18% (+2.60%)

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[dfeigin-nv]

Moved to ai-dynamo/snapshot#88.