Remove deprecated VLLM_ATTENTION_BACKEND env var and docs

[genevera]

Agent-Logs-Url: https://github.com/genevera/harbor/sessions/926d69c8-994a-4ec5-869b-2ad5bb9c3d05

VLLM_ATTENTION_BACKEND was deprecated in v0.13.0 - it is ignored now when starting VLLM so there's no reason for it to be still treated as something special by harbor

[Copilot]

Pull request overview

Removes Harbor’s special handling and documentation for the deprecated VLLM_ATTENTION_BACKEND setting, aligning Harbor’s vLLM integration with vLLM’s current behavior.

Changes:

• Stop passing VLLM_ATTENTION_BACKEND into the vLLM compose service.
• Remove the default profile value for HARBOR_VLLM_ATTENTION_BACKEND.
• Remove the harbor vllm attention subcommand and its CLI reference/user guide mentions.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
services/compose.vllm.yml	Removes VLLM_ATTENTION_BACKEND from the vLLM container environment.
profiles/default.env	Drops HARBOR_VLLM_ATTENTION_BACKEND from the default profile.
harbor.sh	Removes the vllm attention CLI subcommand and help text.
docs/3.-Harbor-CLI-Reference.md	Deletes the CLI reference section for harbor vllm attention.
docs/1.-Harbor-User-Guide.md	Removes VLLM_ATTENTION_BACKEND from example config ls output.

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[genevera]

Solves #229

[av]

Thank you so much!