[Lint]Style: Convert root, benchmarks, tools and docs to ruff format (#5843)

### What this PR does / why we need it?
Description
This PR fixes linting issues in the root directory, benchmarks/, tools/
and docs/ to align with the project's Ruff configuration.

This is part of a gradual effort to enable full linting coverage across
the repository. The corresponding paths have been removed from the
exclude list in pyproject.toml.

### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

- vLLM version: v0.13.0
- vLLM main:
2f4e6548ef

---------

Signed-off-by: root <root@LAPTOP-VQKDDVMG.localdomain>
Co-authored-by: root <root@LAPTOP-VQKDDVMG.localdomain>

tools/send_request.py

@@ -20,10 +20,12 @@ def send_v1_completions(prompt, model, server, request_args=None):
 def send_v1_chat_completions(prompt, model, server, request_args=None):
     data: dict[str, Any] = {
         "model": model,
-        "messages": [{
-            "role": "user",
-            "content": prompt,
-        }],
+        "messages": [
+            {
+                "role": "user",
+                "content": prompt,
+            }
+        ],
     }
     if request_args:
         data.update(request_args)