Projects with a saved fixed Runtime model could incorrectly claim to follow
the global Runtime configuration. Restore the fixed-model description while
keeping the simplified menu and the ability to return to inherited settings.
Model resolution, permissions, and remote Agent behavior are unchanged.
Validation: 3911 tests passed, 66 skipped; typecheck, lint, and release-note
validation passed. Added bilingual regressions for all three Agent Runtimes.
Release note: 项目已固定 Runtime 模型时，现在明确显示所用固定模型，不再误报为跟随全局设置。
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