fix(adapter): preserve discovered context windows

[dingyi222666]

This pr preserves discovered model context windows for DeepSeek and Doubao chat models.

Bug Fixes

• Pass discovered DeepSeek model max context sizes into the chat model constructor.
• Pass discovered Doubao model max context sizes into the chat model constructor.
• Raise the shared DeepSeek fallback context window to match the current adapter default.

Validation

• yarn lint-fix (0 errors, existing max-len warnings in packages/extension-agent/src/sub-agent/builtin.ts only)

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[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 1315a034-73cc-4171-83e1-741a7114d060

📥 Commits

Reviewing files that changed from the base of the PR and between 073b6c0 and a32df72.

📒 Files selected for processing (3)

• packages/adapter-deepseek/src/client.ts
• packages/adapter-doubao/src/client.ts
• packages/shared-adapter/src/client.ts

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Walkthrough

在 DeepSeek 和 DouBao 适配器的 _createModel 方法中，创建 ChatLunaChatModel 时新增 modelMaxContextSize 参数，取值自 info.maxTokens。同时，共享适配器中 DeepSeek 的默认最大上下文容量从 128000 更新为 1_000_000。

Changes

模型最大上下文大小修正

Layer / File(s)	Summary
更新共享适配器 DeepSeek 默认上下文容量 packages/shared-adapter/src/client.ts	modelMaxContextSizeTable 中 deepseek 的默认最大上下文容量常量由 128000 改为 1_000_000。
DeepSeek 与 DouBao 适配器传入 modelMaxContextSize packages/adapter-deepseek/src/client.ts, packages/adapter-doubao/src/client.ts	两个适配器的 _createModel 方法在构造 ChatLunaChatModel 时，新增 modelMaxContextSize 字段并赋值为 info.maxTokens。

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• ChatLunaLab/chatluna#915：同样修改 DeepSeek 适配器的 _createModel，将 modelMaxContextSize 从 info.maxTokens 传入，与本 PR 的 DeepSeek 上下文处理直接相关。
• ChatLunaLab/chatluna#905：在 packages/adapter-deepseek/src/client.ts 中调整了 DeepSeek 模型上下文大小的选取逻辑，与本 PR 的修改高度相关。
• ChatLunaLab/chatluna#903：在 adapter-doubao 模型列表中新增了 DeepSeek V4 模型及其 maxTokens 配置，直接影响本 PR 中 DouBao 适配器读取 info.maxTokens 的行为。

Poem

🐇 兔子轻轻改一行，
上下文从十二万跳到百万场，
DeepSeek 与豆包齐传参，
maxTokens 不再默默藏。
代码虽短，意义悠长～ ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	标题清晰明确地反映了PR的主要目的：在适配器中保留发现的上下文窗口大小。
Description check	✅ Passed	描述详细关联到变更集的所有方面，包括对DeepSeek和Doubao模型最大上下文大小的修复和验证步骤。
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ds-context-window-2

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[gemini-code-assist]

Code Review

This pull request adds modelMaxContextSize to the Deepseek and Doubao clients, and increases the fallback context size for Deepseek to 1,000,000 in the shared adapter. The reviewer recommends keeping the Deepseek fallback at 128,000 to avoid API errors with standard models, and suggests adding fallback values for modelMaxContextSize in both the Deepseek and Doubao clients to handle cases where info.maxTokens is undefined.

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