fix(presets): harden preset URL installs against unsafe redirects (#2911)

* Harden preset URL installs against unsafe redirects

Preset URL installs already rejected non-HTTPS source URLs, but the authenticated opener follows redirects. Validate the final response URL before writing the ZIP, preserve GitHub release asset URL resolution after the preset command module split, stream the response to disk, and keep catalog config serialization on safe YAML output.

Constraint: open_url follows redirects, so source URL validation alone does not constrain the downloaded target

Rejected: Keep response.read() for simplicity | large preset downloads should not be buffered entirely in memory

Confidence: high

Scope-risk: narrow

Directive: Keep preset URL policy aligned with workflow installer redirect validation

Tested: uvx ruff check src/specify_cli/__init__.py src/specify_cli/presets/__init__.py src/specify_cli/presets/_commands.py tests/test_presets.py

Tested: uv run pytest tests/test_presets.py -q

Not-tested: Real network redirect integration against a live HTTP server

Co-authored-by: OmX <omx@oh-my-codex.dev>

* Reject malformed preset download URLs

Preset downloads should fail early when a URL lacks a hostname, even if the scheme is HTTPS. The redirect error now describes any disallowed target instead of implying that only non-HTTPS redirects are blocked.

* Prevent credentialed preset redirects from downgrading transport

Preset URL downloads already checked the final URL after urllib followed redirects, but that was too late for authenticated requests because same-host redirects could preserve Authorization during the redirect itself. The authenticated HTTP helper now supports an opt-in redirect validator, and preset downloads use it to reject disallowed redirect targets before following them. The redirect auth handlers also stop preserving credentials across HTTPS to non-HTTPS downgrades as defense in depth.

* test(presets): 修复 URL 解析测试 mock 缺少 redirect_validator 参数

重定向安全加固为 open_url 新增 redirect_validator 参数，
两处 fake_open_url mock 签名未同步导致 TypeError。
补齐参数后全部 3717 个测试通过。

---------

Co-authored-by: OmX <omx@oh-my-codex.dev>

tests/test_github_http.py

@@ -187,4 +187,4 @@ class TestResolveGitHubReleaseAssetApiUrl:
             capturing_open,
         )
         assert len(captured_urls) == 1
-        assert "releases/tags/v1%23beta" in captured_urls[0]
+        assert "releases/tags/v1%23beta" in captured_urls[0]