feat(ai-proxy): gemini model thinking support (#2712)

plugins/wasm-go/extensions/ai-proxy/README.md

@@ -231,10 +231,11 @@ Cloudflare Workers AI 所对应的 `type` 为 `cloudflare`。它特有的配置
 
 Gemini 所对应的 `type` 为 `gemini`。它特有的配置字段如下：
 
-| 名称                  | 数据类型      | 填写要求 | 默认值   | 描述                                                                                                                                       |
-| --------------------- | ------------- | -------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------ |
-| `geminiSafetySetting` | map of string | 非必填   | -        | Gemini AI 内容过滤和安全级别设定。参考[Safety settings](https://ai.google.dev/gemini-api/docs/safety-settings)                             |
-| `apiVersion`          | string        | 非必填   | `v1beta` | 用于指定 API 的版本, 可选择 `v1` 或 `v1beta` 。 版本差异请参考[API versions explained](https://ai.google.dev/gemini-api/docs/api-versions)。 |
+| 名称                   | 数据类型      | 填写要求 | 默认值   | 描述                                                         |
+| ---------------------- | ------------- | -------- | -------- | ------------------------------------------------------------ |
+| `geminiSafetySetting`  | map of string | 非必填   | -        | Gemini AI 内容过滤和安全级别设定。参考[Safety settings](https://ai.google.dev/gemini-api/docs/safety-settings) |
+| `apiVersion`           | string        | 非必填   | `v1beta` | 用于指定 API 的版本, 可选择 `v1` 或 `v1beta` 。 版本差异请参考[API versions explained](https://ai.google.dev/gemini-api/docs/api-versions)。 |
+| `geminiThinkingBudget` | number        | 非必填   | -        | gemini2.5系列的参数，0是不开启思考，-1动态调整，具体参数指可参考官网 |
 
 #### DeepL
 

plugins/wasm-go/extensions/ai-proxy/README_EN.md

@@ -200,6 +200,8 @@ For Gemini, the corresponding `type` is `gemini`. Its unique configuration field
 | Name                  | Data Type | Filling Requirements | Default Value | Description                                                                                              |
 |---------------------|----------|----------------------|---------------|---------------------------------------------------------------------------------------------------------|
 | `geminiSafetySetting` | map of string   | Optional             | -             | Gemini AI content filtering and safety level settings. Refer to [Safety settings](https://ai.google.dev/gemini-api/docs/safety-settings). |
+| `apiVersion` | string | 非必填 | `v1beta` | To specify the version of the API, you can choose either 'v1' or 'v1beta'. Version differences refer to https://ai.google.dev/gemini-api/docs/api-versions |
+| `geminiThinkingBudget` | number | 非必填 | - | The parameters of the gemini2.5 series: 0 indicates no thinking mode, -1 represents dynamic adjustment. For specific parameter references, please refer to the official website |
 
 ### DeepL
 

plugins/wasm-go/extensions/ai-proxy/provider/gemini.go

@@ -28,6 +28,12 @@ const (
 	geminiImageGenerationPath      = "predict"
 )
 
+var geminiThinkingModels = map[string]bool{
+	"gemini-2.5-pro":        true,
+	"gemini-2.5-flash":      true,
+	"gemini-2.5-flash-lite": true,
+}
+
 type geminiProviderInitializer struct{}
 
 func (g *geminiProviderInitializer) ValidateConfig(config *ProviderConfig) error {
@@ -365,6 +371,7 @@ func (g *geminiProvider) buildGeminiChatRequest(request *chatCompletionRequest)
 			Threshold: threshold,
 		})
 	}
+
 	geminiRequest := geminiGenerationContentRequest{
 		Contents:       make([]geminiChatContent, 0, len(request.Messages)),
 		SafetySettings: safetySettings,
@@ -379,6 +386,13 @@ func (g *geminiProvider) buildGeminiChatRequest(request *chatCompletionRequest)
 		},
 	}
 
+	if geminiThinkingModels[request.Model] {
+		geminiRequest.GenerationConfig.ThinkingConfig = &geminiThinkingConfig{
+			IncludeThoughts: true,
+			ThinkingBudget:  g.config.geminiThinkingBudget,
+		}
+	}
+
 	if request.Tools != nil {
 		functions := make([]function, 0, len(request.Tools))
 		for _, tool := range request.Tools {

plugins/wasm-go/extensions/ai-proxy/provider/provider.go

@@ -344,6 +344,9 @@ type ProviderConfig struct {
 	// @Title zh-CN Gemini AI内容过滤和安全级别设定
 	// @Description zh-CN 仅适用于 Gemini AI 服务。参考：https://ai.google.dev/gemini-api/docs/safety-settings
 	geminiSafetySetting map[string]string `required:"false" yaml:"geminiSafetySetting" json:"geminiSafetySetting"`
+	// @Title zh-CN Gemini Thinking Budget 配置
+	// @Description zh-CN 仅适用于 Gemini AI 服务，用于控制思考预算
+	geminiThinkingBudget int64 `required:"false" yaml:"geminiThinkingBudget" json:"geminiThinkingBudget"`
 	// @Title zh-CN Vertex AI访问区域
 	// @Description zh-CN 仅适用于Vertex AI服务。如需查看支持的区域的完整列表，请参阅https://cloud.google.com/vertex-ai/generative-ai/docs/learn/locations?hl=zh-cn#available-regions
 	vertexRegion string `required:"false" yaml:"vertexRegion" json:"vertexRegion"`
@@ -472,6 +475,7 @@ func (c *ProviderConfig) FromJson(json gjson.Result) {
 			c.geminiSafetySetting[k] = v.String()
 		}
 	}
+	c.geminiThinkingBudget = json.Get("geminiThinkingBudget").Int()
 	c.vertexRegion = json.Get("vertexRegion").String()
 	c.vertexProjectId = json.Get("vertexProjectId").String()
 	c.vertexAuthKey = json.Get("vertexAuthKey").String()