go:embed stdlib_list.txt file in gazelle/python/std_modules.go is missing

# 🐞 bug report

### Affected Rule

The issue is caused by the rule:

### Is this a regression?

Yes, the previous version in which this bug was not present was: ....

### Description

A clear and concise description of the problem...
Adding Gazelle to go.mod results in a failure running go list -deps ./... because the stdlib_list.txt used in the go:embed in gazelle/python/std_modules.go does not exist

## 🔬 Minimal Reproduction

Add something like the following to go.mod

github.com/bazel-contrib/rules_python/gazelle v0.0.0-20260330223627-293e643aa3ea

go list -deps ./... > /dev/null

## 🔥 Exception or Error

../../pkg/mod/github.com/bazel-contrib/rules_python/gazelle@v0.0.0-20260330223627-293e643aa3ea/python/std_modules.go:24:13: pattern stdlib_list.txt: no matching files found

## 🌍 Your Environment

**Operating System:**

  

macOS 15.4.1

  

**Output of `bazel version`:**

  

$ bazel version

Build label: 7.7.1

Build target: @@//src/main/java/com/google/devtools/build/lib/bazel:BazelServer

Build time: Wed Nov 12 17:35:45 2025 (1762968945)

Build timestamp: 1762968945

Build timestamp as int: 1762968945

  

**Rules_python version:**

  

1.8.4

  

**Anything else relevant?**

从 gazelle/python/std_modules.go 开始，检查对 stdlib_list.txt 的 go:embed 引用。使用报告中的 Gazelle 依赖通过 go list -deps ./... 重现失败，然后验证缺失的嵌入文件已存在且命令成功完成。

由索引模型根据 Issue 内容生成。