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

[paul-nechifor]

Closes DIM-1174

• Adds a Docker image and Compose setup for hosting the relay, cockpit, and web SDK on your own server. Certificates and access credentials are supplied through separate configuration files.
• Adds a hosting guide covering server setup, certificate renewal, and connecting robots and operators. It also explains how to run without Docker or on a local network.
• Adds a CI check that builds the relay image to catch packaging failures.

[greptile-apps]

Greptile Summary

Adds production-oriented packaging and documentation for hosting the web relay.

• Builds the relay and web applications into an unprivileged Deno container.
• Provides a Compose deployment with TLS/auth configuration mounted read-only and TCP/UDP 443 published.
• Documents certificate renewal, authentication, robot/operator setup, systemd deployment, LAN certificates, and troubleshooting.
• Adds a CI image-build check and links the hosting guide from existing web documentation.

Confidence Score: 5/5

Merge-safe: no outstanding issues require changes before merging.

No accepted new findings or outstanding previous findings contribute to the assessment.

_{Reviews (2): Last reviewed commit: "feat(web): relay Dockerfile, compose fil..." | Re-trigger Greptile}

[codecov]

Codecov Report

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

@@                     Coverage Diff                      @@
##             paul/feat/t12d-relay-auth    #3954   +/-   ##
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  Coverage                             ?   78.16%           
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  Files                                ?     1428           
  Lines                                ?   134916           
  Branches                             ?    11644           
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  Hits                                 ?   105453           
  Misses                               ?    26160           
  Partials                             ?     3303           

Components	Coverage Δ
Tests	94.50% <ø> (?)

Flag	Coverage Δ
OS-ubuntu-24.04-arm	74.48% <ø> (?)
OS-ubuntu-latest	75.05% <ø> (?)
Py-3.10	75.04% <ø> (?)
Py-3.11	75.04% <ø> (?)
Py-3.12	75.04% <ø> (?)
Py-3.13	75.04% <ø> (?)
Py-3.14	74.48% <ø> (?)
Py-3.14t	75.05% <ø> (?)
SelfHosted-Large	30.75% <ø> (?)
SelfHosted-Linux	35.57% <ø> (?)

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