fix(frontend): default Codex/CC Switch key templates to gpt-5.6

[DylanChiang-Dev]

Closes #4029

English

Two frontend spots hardcoded gpt-5.5 as the Codex default model, both stale now that GPT-5.6 is available and already present in the openaiModels map / backend pricing:

• frontend/src/components/keys/UseKeyModal.vue — generateOpenAIFiles() and generateOpenAIWsFiles() (the "Codex CLI" and "Codex CLI (WebSocket)" tabs) emitted model = "gpt-5.5" / review_model = "gpt-5.5".
• frontend/src/utils/ccswitchImport.ts — OPENAI_CC_SWITCH_CODEX_MODEL = "gpt-5.5", used for the CC Switch import deeplink.

Users copying the generated Codex config or importing into CC Switch got a config pinned to gpt-5.5 with no hint that 5.6 exists, and had to edit it by hand.

Change

Bump both defaults (model + review_model) to gpt-5.6, and update the corresponding specs (UseKeyModal.spec.ts, ccswitchImport.spec.ts).

This is a minimal literal bump. A follow-up could source the default from openaiModels so it never drifts again, but that is a larger refactor and left out here to keep the change focused.

Testing

vitest run on the two affected spec files — 10 tests pass.

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中文

前端有两处把 gpt-5.5 写死为 Codex 的默认模型，在 GPT-5.6 已可用（且已存在于 openaiModels 与后端定价数据）的情况下都已过时：

• frontend/src/components/keys/UseKeyModal.vue —— generateOpenAIFiles() 与 generateOpenAIWsFiles()（"Codex CLI" 与 "Codex CLI (WebSocket)" 分页）输出 model = "gpt-5.5" / review_model = "gpt-5.5"。
• frontend/src/utils/ccswitchImport.ts —— OPENAI_CC_SWITCH_CODEX_MODEL = "gpt-5.5"，用于 CC Switch 导入 deeplink。

用户复制生成的 Codex 配置、或导入到 CC Switch 后，得到的是写死在 gpt-5.5 上的配置，没有任何提示 5.6 已可用，只能手动修改。

改动

将两处默认值（model + review_model）提升到 gpt-5.6，并同步更新对应测试（UseKeyModal.spec.ts、ccswitchImport.spec.ts）。

这是最小的字面量提升。后续可以让默认值直接从 openaiModels 读取以彻底避免再次过时，但那是更大的重构，本 PR 为保持聚焦未纳入。

测试

对两个受影响的测试文件运行 vitest run —— 10 个测试全部通过。

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[DylanChiang-Dev]

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