feat(web): relay Dockerfile, compose file, and hosting guide - #3954

Confidence Score: 5/5

Safe to merge.

Summary

• Adds a Deno-based relay container, Docker Compose configuration, and CI image-build coverage.
• Adds robot-key and viewer-token authentication across the shared protocol, relay, Python bridge, SDK, and Cockpit.
• Prevents relay and API secrets from appearing in configuration output or persisted restart metadata.
• Documents public-server, systemd, certificate-renewal, and private-LAN deployment workflows.

_{Reviews (3) · Last reviewed commit: "feat(web): relay Dockerfile, compose fil..."}

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

@@            Coverage Diff             @@
##             main    #3954      +/-   ##
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- Coverage   78.90%   78.89%   -0.01%     
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  Files        1469     1469              
  Lines      138999   138999              
  Branches    11941    11941              
==========================================
- Hits       109672   109668       -4     
- Misses      25930    25932       +2     
- Partials     3397     3399       +2     

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