docs(site): update gemini example (#811)

Author: quanru

apps/site/docs/en/choose-a-model.mdx

@@ -42,7 +42,7 @@ After applying for the API key on [Google Gemini](https://gemini.google.com/), y
 ```bash
 OPENAI_BASE_URL="https://generativelanguage.googleapis.com/v1beta/openai/"
 OPENAI_API_KEY="......"
-MIDSCENE_MODEL_NAME="gemini-2.5-pro-preview-03-25"
+MIDSCENE_MODEL_NAME="gemini-2.5-pro-preview-05-06"
 MIDSCENE_USE_GEMINI=1
 ```
 
@@ -165,8 +165,8 @@ When using Gemini-2.5-Pro, you should use the `MIDSCENE_USE_GEMINI=1` config to
 
 ```bash
 OPENAI_BASE_URL="https://generativelanguage.googleapis.com/v1beta/openai/"
-OPENAI_API_KEY="......"
-MIDSCENE_MODEL_NAME="gemini-2.5-pro"
+OPENAI_API_KEY="...."
+MIDSCENE_MODEL_NAME="gemini-2.5-pro-preview-05-06"
 MIDSCENE_USE_GEMINI=1
 ```
 

apps/site/docs/zh/choose-a-model.mdx

@@ -64,7 +64,7 @@ MIDSCENE_USE_VLM_UI_TARS=DOUBAO
 ```bash
 OPENAI_BASE_URL="https://generativelanguage.googleapis.com/v1beta/openai/"
 OPENAI_API_KEY="...."
-MIDSCENE_MODEL_NAME="gemini-2.5-pro-preview-03-25"
+MIDSCENE_MODEL_NAME="gemini-2.5-pro-preview-05-06"
 MIDSCENE_USE_GEMINI=1
 ```
 
@@ -228,9 +228,9 @@ Midscene.js 从 v0.15.1 版本开始支持 Gemini-2.5-Pro 模型。
 **配置**
 
 ```bash
-OPENAI_BASE_URL="https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-pro:generateContent?key=......"
-OPENAI_API_KEY="......"
-MIDSCENE_MODEL_NAME="gemini-2.5-pro"
+OPENAI_BASE_URL="https://generativelanguage.googleapis.com/v1beta/openai/"
+OPENAI_API_KEY="...."
+MIDSCENE_MODEL_NAME="gemini-2.5-pro-preview-05-06"
 MIDSCENE_USE_GEMINI=1
 ```