Fix: search-service typo and model reference issues

[dingyi222666]

This PR fixes several issues in the search-service package that were causing errors in browser mode.

Bug fixes

• Fix typo: mulitSourceMode → multiSourceMode in config schema and usage
• Fix model reference issues with proper null checking using optional chaining
• Update SearchTool to use ComputedRef<ChatLunaChatModel> for proper type safety
• Fix browserModelRef usage in web_search tool registration

Other Changes

• Bump package version to 1.3.0-alpha.0 for next development cycle

Closes #561

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

本次变更统一改用计算引用获取摘要模型，修正配置字段名 mulitSourceMode→multiSourceMode，并在多源限制计算中使用正确字段。搜索工具的 LLM 改为 ComputedRef 访问。多处调用改为使用 ?.value 进行空安全访问与传递。

Changes

Cohort / File(s)	Summary
模型引用与浏览器工具调整 packages/search-service/src/index.ts	引入 browserModelRef 由 keywordExtractModel?.value 派生；在 web_search 路径用 browserModelRef 替代直接模型；web_browser 内新增 summaryModel（来源 keywordExtractModel?.value ?? params.model），并在 PuppeteerBrowserTool 构造中使用；相关调用统一改为空安全访问与新引用。
配置字段更名与使用修正 packages/search-service/src/index.ts, packages/search-service/src/provide.ts	将公开 Config 字段 mulitSourceMode 更名为 multiSourceMode；同步更新 Schema 类型与默认映射；在多源信号上限计算中使用 this.config.multiSourceMode 驱动平均分配或总量路径。
搜索工具 LLM 访问方式 packages/search-service/src/tools/search.ts	SearchTool 的 llm 类型改为 ComputedRef<ChatLunaChatModel>；构造与内部访问改为 this.llm?.value；更新导入与 generateFakeSearchResult 调用。

Sequence Diagram(s)

sequenceDiagram
  autonumber
  participant User as User
  participant Chain as BrowsingChain
  participant Cfg as Config
  participant Models as ModelRefs
  participant Tool as PuppeteerBrowserTool

  User->>Chain: 切换到浏览模式
  Chain->>Models: 读取 keywordExtractModel?.value
  alt 有提取模型
    Models-->>Chain: 返回模型
  else 无提取模型
    Chain-->>Chain: 使用 params.model 作为 summaryModel
  end
  Chain->>Tool: 构造时传入 summaryModel（Computed/Ref）
  Note over Tool: 内部通过 .value 读取模型
  Tool-->>User: 执行浏览与摘要

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sequenceDiagram
  autonumber
  participant Cfg as Config
  participant Prov as ProviderManager

  Cfg-->>Prov: multiSourceMode, limit
  alt multiSourceMode == "average"
    Prov-->>Prov: signalLimit = limit / providers
  else multiSourceMode == "total"
    Prov-->>Prov: signalLimit = limit
  end
  Prov-->>Prov: 按 signalLimit 分发请求

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sequenceDiagram
  autonumber
  participant Search as SearchTool
  participant LLM as ComputedRef<ChatModel>

  Search->>LLM: 访问 llm?.value
  alt value 存在
    LLM-->>Search: ChatModel
    Search-->>Search: 生成/伪造搜索结果
  else value 为空
    Search-->>Search: 走空安全分支（避免读取 null.value）
  end

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

我在终端草地蹦又跳，
把 mulit 的字母轻轻校，
模型改为引用抱怀抱，
?.value 防止空指尖乱跑。
多源分配各自一小勺，
浏览链路顺畅不再闹。
啦啦——兔耳随提交轻摇 🐇✨

✨ Finishing touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/search-service

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 3f08420 and a816545.

⛔ Files ignored due to path filters (1)

• packages/search-service/package.json is excluded by !**/*.json

📒 Files selected for processing (3)

• packages/search-service/src/index.ts (5 hunks)
• packages/search-service/src/provide.ts (1 hunks)
• packages/search-service/src/tools/search.ts (3 hunks)

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