fix: support anthropic SDK 1.0 httpx2 module

[wcqqq1214]

Modifications / 改动点

Anthropic SDK 1.0.0 (released 2026-08-20; see Claude Platform release notes) renamed its internal transport module from anthropic._base_client.httpx to httpx2. Since uv.lock is gitignored, CI resolves anthropic>=0.51.0 to the latest PyPI release, so since 2026-08-21 every run installs anthropic==1.0.0 and the existing unit test test_create_http_client_uses_anthropic_httpx_module fails (module 'anthropic._base_client' has no attribute 'httpx').

• astrbot/core/provider/sources/anthropic_source.py: resolve the SDK's own httpx module preferring httpx2 (anthropic 1.x) and falling back to httpx (anthropic 0.x), so proxy clients still pass the SDK's isinstance check when multiple httpx installations are on sys.path.

• tests/test_anthropic_kimi_code_provider.py: mirror the same resolution in the test instead of hard-coding the private httpx attribute.

• This is NOT a breaking change. / 这不是一个破坏性变更。

Verification Steps / 验证步骤

1. Ran with anthropic==1.0.0 installed (venv, httpx2 present, httpx absent):
   • pytest tests/test_anthropic_kimi_code_provider.py → 27 passed
   • full pytest tests/ → 2163 passed
   • ruff format --check and ruff check → clean
2. Fallback path (httpx attribute) is covered by the existing test_create_http_client_falls_back_to_global_httpx_module.

Screenshots or Test Results / 运行截图或测试结果

$ pytest tests/test_anthropic_kimi_code_provider.py -q
27 passed, 1 warning in 1.06s

$ pytest tests/ -q
2163 passed, 19 warnings in 74.88s

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Checklist / 检查清单

• 😊 If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
  / 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。

• 👀 My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
  / 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。

• 🤓 I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
  / 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到 requirements.txt 和 pyproject.toml 文件相应位置。

• 😮 My changes do not introduce malicious code.
  / 我的更改没有引入恶意代码。

Summary by Sourcery

Maintain Anthropic proxy client compatibility across SDK versions by supporting both the new and legacy internal HTTP transport modules.

Bug Fixes:

• Support Anthropic SDK 1.x by resolving its renamed internal HTTP transport module while retaining compatibility with SDK 0.x.

Tests:

• Update Anthropic provider tests to validate the SDK-compatible transport module across supported SDK versions.

Summary by Sourcery

Maintain Anthropic provider compatibility across SDK versions by supporting both the new and legacy internal HTTP transport modules.

Bug Fixes:

• Support Anthropic SDK 1.x while retaining compatibility with SDK 0.x by resolving either its renamed or legacy internal HTTP transport module for proxy clients.

Tests:

• Update Anthropic provider tests to validate the SDK-compatible HTTP transport module across supported SDK versions.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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