feat(adapter-openai-like): support additional request headers

[dingyi222666]

Changes

• Add an additionHeaders option to the openai-like adapter for custom request headers (e.g. x-opencode-session).
• Custom headers are applied first, then the built-in headers (Authorization, Content-Type, Cookie, etc.) are applied on top, so critical headers cannot be overridden.
• Fix additionCookies concatenation: it was treated as an object although its type is [string, string][], which produced values like 0=name,value; it is now mapped as tuples into key=value; key2=value2.
• Add zh-CN/en-US config descriptions.

Verification

• yarn fast-build adapter-openai-like
• tsc --noEmit -p packages/adapter-openai-like/tsconfig.json

Closes #1035

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⚙️ Run configuration

Configuration used: Repository UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 74a2063 and fd8527e.

⛔ Files ignored due to path filters (2)

• packages/adapter-openai-like/src/locales/en-US.schema.yml is excluded by !**/*.yml
• packages/adapter-openai-like/src/locales/zh-CN.schema.yml is excluded by !**/*.yml

📒 Files selected for processing (2)

• packages/adapter-openai-like/src/index.ts
• packages/adapter-openai-like/src/requester.ts

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Walkthrough

配置新增 additionHeaders 字段及默认值。buildHeaders 将配置中的键值对合并到请求头中。

Changes

自定义请求头

Layer / File(s)	Summary
配置定义与请求头合并 packages/adapter-openai-like/src/index.ts, packages/adapter-openai-like/src/requester.ts	Config 和配置 Schema 新增 additionHeaders。buildHeaders 将每个键值对写入请求头。

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to fd852

The added custom-header configuration is consistently passed into request construction, with no actionable merge risk identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	标题明确说明为 adapter-openai-like 增加自定义请求头功能，与变更主体一致。
Description check	✅ Passed	描述说明了 additionHeaders 配置、请求行为、配置文档和验证命令，与变更内容相关。
Linked Issues check	✅ Passed	[ #1035 ] 要求为 chatluna-openai-like-adapter 增加自定义请求头，以支持 x-opencode-session。Config 新增 additionHeaders: [string, string][]，配置 Schema 提供空数组默认值。requester.ts 的 buildHeaders 将每个键值对合并到请求头，因此该配置可以…
Out of Scope Changes check	✅ Passed	当前可审查的变更仅涉及 packages/adapter-openai-like/src/index.ts 和 packages/adapter-openai-like/src/requester.ts。这些变更分别增加配置字段和请求头合并逻辑，均直接支持 #1035。未发现与该目标无关的代码变更。两个 locale schema 文件被明确排除，不能据此判断配置说明是否完整；该排除不构成…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…

✨ Finishing Touches

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/openai-like-addition-headers

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_{小兔添上请求头，
键值成对排好队。
配置写入新字段，
请求携带新标记。
OpenAI-like 轻快跑。}

_{Comment @coderabbitai help to get the list of available commands.}