## What this PR does / why we need it?

Prepares the first v0.24.0 release candidate documentation set:

- adds the v0.24.0rc1 release notes and dependency matrix;
- updates the English and Chinese README files, FAQ, compatibility
information, and documentation substitutions;
- adds v0.24.0rc1 and releases/v0.24.0rc to the manual image-build
workflow selectors;
- records the reviewed release scope, limitations, deprecation notes,
and known issues without introducing runtime or API changes.

The release note in this PR is the authoritative source for the
v0.24.0rc1 feature scope and known issues. The release checklist tracks
only the remaining release operations.

Related release tracking:

- Feedback: https://github.com/vllm-project/vllm-ascend/issues/13051
- Checklist: https://github.com/vllm-project/vllm-ascend/issues/13052

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

No runtime or API behavior changes. It updates release documentation and
a maintainer-facing release-branch workflow selector.

## How was this patch tested?

- `git diff --check`
- `python -m py_compile docs/source/conf.py`
- `python docs/source/conf.py`
- `bash format.sh ci`
- NPU tests were not run because this patch does not change runtime
code.


https://github.com/vllm-project/vllm/commit/85c09e9885e346ea1612da30ebff5a75f67d2350

- vLLM version: v0.24.0
- vLLM main:
https://github.com/vllm-project/vllm/commit/85c09e9885e346ea1612da30ebff5a75f67d2350

---------

Signed-off-by: weijinqian0 <1184188277@qq.com>
Co-authored-by: Wang Kunpeng <1289706727@qq.com>