💄 style: Enable Grounding with Google Search for Gemini 2.0

[sxjeru]

💻 变更类型 | Change Type

• ✨ feat
• 🐛 fix
• ♻️ refactor
• 💄 style
• 👷 build
• ⚡️ perf
• 📝 docs
• 🔨 chore

🔀 变更说明 | Description of Change

https://ai.google.dev/gemini-api/docs/grounding

Gemini 2.0 模型拥有每日免费 500 次搜索请求配额。

在 #5431 按钮功能实现前，只能是不太灵活的环境变量来禁用该功能。（避免收费）

GEMINI_SEARCH_ENABLED 设为 1 则启用搜索功能，由于该功能可能收费，默认禁用。

参考文档，模型可以自动在合适的时机启用搜索，避免浪费配额，应当可以将 Grounding 搜索设为默认启用。

Starting with Gemini 2.0, Google Search is available as a tool. This means that the model can decide when to use Google Search.
从 Gemini 2.0 开始，Google 搜索作为工具提供。这意味着模型可以决定何时使用 Google 搜索。

注意启用的是只有 Gemini 2.0 模型才可享受的 googleSearch，1.5 系列与之无关。

根据测试，Grounding 暂时无法和 functionCall 共存，启用 functionCall 时会自动关闭 Grounding 搜索。

📝 补充信息 | Additional Information

• 💄 style: Enable googleSearch Tool for gemini-2.0-flash-exp #4997
• close [Request] Gemini API Integration with Grounding #5892

已确认可用。

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[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 16 lines in your changes missing coverage. Please review.

Project coverage is 92.31%. Comparing base (7d782b1) to head (9d9c45e).
Report is 52 commits behind head on main.

Files with missing lines	Patch %	Lines
src/libs/agent-runtime/google/index.ts	42.85%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5778      +/-   ##
==========================================
- Coverage   92.33%   92.31%   -0.03%     
==========================================
  Files         647      647              
  Lines       58526    58553      +27     
  Branches     4293     4297       +4     
==========================================
+ Hits        54042    54054      +12     
- Misses       4484     4499      +15     

Flag	Coverage Δ
app	92.31% <42.85%> (-0.03%)	⬇️
server	98.01% <ø> (ø)

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