fix: generate catalog when user configures context window (#1594)

[dongyu23]

Summary

Completes PR #1722 by fixing the two failing integration tests.

PR #1722 fixed the early return in apply_model_catalog_to_config that silently dropped the Manager's context window for suffixless custom models. Without the fix, Codex fell back to its bundled 272000 default and the CLI showed ~258K instead of the configured value (#1594).

The fix moves the fallback parse before the early return and adds fallback.is_none() to the guard, so a user-configured context window forces catalog generation.

Test fixes

Two integration tests failed because they set context_window=200000 while asserting no catalog generation. With the fix, configuring a context window now correctly triggers generation.

• apply_relay_profile_does_not_write_model_catalog_json_for_selected_models: removed context_window / auto_compact_limit, preserving the original intent — no catalog when nothing is customized.
• apply_relay_profile_no_catalog_when_model_list_has_no_suffix → renamed to apply_relay_profile_generates_catalog_when_context_window_configured: now tests the positive case — context_window set, no suffix → catalog IS generated with the correct window value in both config.toml and the catalog JSON.

Verification

cargo fmt --all -- --check   ✅
cargo clippy -p codex-plus-core --all-targets   ✅ (zero warnings on changed code)
cargo test -p codex-plus-core --test relay_config   ✅ 107 passed, 0 failed
cargo test -p codex-plus-core --lib   ✅ 209 passed, 0 failed

Closes #1722
References #1594

[BigPizzaV3]

代码审查：#1722 的失败测试已在本 PR 中按新行为修正，逻辑与 issue #1594 目标一致。当前没有可用的 CI check（状态 UNSTABLE），建议先触发/补齐全平台 CI，再合并。

[dongyu23]

已补齐全平台 CI，并修复了 Windows checkout 下字节哈希测试受 CRLF 转换影响的问题。

最新提交：48163e9

Fork 上针对该提交手动触发的完整 PR build artifacts 已全部通过：

• Windows artifacts：成功（包含前端测试、TypeScript 检查、前端构建、cargo test --workspace、release 构建、NSIS 安装包及产物上传）
• macOS DMG (x64)：成功
• macOS DMG (arm64)：成功

运行记录：
https://github.com/dongyu23/CodexPlusPlus/actions/runs/31497679527

上游 PR 页面目前仍未显示原生 checks；此前上游 run 的 action_required 且 jobs=[] 表明外部 fork workflow 需要仓库维护者批准。烦请批准/触发上游 workflow，或参考上述同 SHA 的全平台绿色运行结果。