chore: add deepep install instruction

[yuki-97]

As title.

Summary by CodeRabbit

• Documentation
  • Clarified bare-metal installation requirements for vLLM’s deep_ep dependency, noting that libibverbs-dev may be needed and providing example apt-get commands.
  • Added inline notes to the dependency configuration highlighting the libibverbs-dev requirement.
  • No functional changes, dependency updates, or build behavior modifications.

[coderabbitai]

Walkthrough

Adds installation notes about libibverbs-dev for deep_ep when installing vLLM outside containers. README gains a note and shell snippet; pyproject.toml gains comment lines under the vllm dependency section. No code, dependency, or build behavior changes.

Changes

Cohort / File(s)	Summary of changes
Docs: installation notes README.md, pyproject.toml	Added documentation/comments noting deep_ep may require libibverbs-dev on bare metal, including example apt-get commands. No functional or dependency updates.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

I twitch my ears at README’s glow,
A tiny note to help installs go.
apt-get whispers, verbs in tow—
No code to tweak, just learn and know.
Hop, hop! The build paths smoothly flow. 🐇✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title "chore: add deepep install instruction" accurately and concisely reflects the main change in the diff (adding installation notes for the deep_ep/deepep dependency in README and pyproject comments), so it is directly related to the changeset and clearly conveys the PR's purpose. It is short, specific, and appropriate for a chore-style change.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch yukih/deepep-instruction

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (2)

README.md (1)

108-113: Add cross‑distro note for non‑Debian systems.

Improves portability for RHEL/CentOS/Rocky users.

Apply this diff to append a brief tip:

 If you encounter problems when installing vllm's dependency deep_ep on bare-metal (outside of a container), you may need to install libibverbs-dev as well. Here is how you can install it:
 ```sh
 sudo apt-get update
 sudo apt-get install libibverbs-dev

+> [!TIP]
+> On RHEL/CentOS/Rocky Linux, install the equivalent development package:
+> sudo dnf install rdma-core-devel

</blockquote></details>
<details>
<summary>pyproject.toml (1)</summary><blockquote>

`71-73`: **Prefer docs over shell command comments in pyproject.**

Keeping install commands in README avoids drift and keeps pyproject clean. Replace with a pointer to the README section.

Apply this diff:

```diff
-    # deep_ep also needs libibverbs-dev
-    # sudo apt-get update
-    # sudo apt-get install libibverbs-dev
+    # DeepEP build on bare-metal requires libibverbs headers; see README ("Bare-metal prerequisites for vLLM/DeepEP").

📜 Review details

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Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 52f1d6a and e726eb1.

📒 Files selected for processing (2)

• README.md (1 hunks)
• pyproject.toml (1 hunks)

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• GitHub Check: Lint check

🔇 Additional comments (1)

README.md (1)

108-113: LGTM: Clear guidance for DeepEP on bare‑metal.

Helpful addition; matches common DeepEP/rdma-core headers requirement outside containers.