feats: repair the thinking of claude to openrouter convert

relay/channel/openai/adaptor.go

@@ -298,6 +298,7 @@ func (a *Adaptor) ConvertOpenAIRequest(c *gin.Context, info *relaycommon.RelayIn
 				}
 
 				reasoning := openrouter.RequestReasoning{
+					Enabled:   true,
 					MaxTokens: *thinking.BudgetTokens,
 				}
 

relay/channel/openrouter/dto.go

@@ -3,6 +3,7 @@ package openrouter
 import "encoding/json"
 
 type RequestReasoning struct {
+	Enabled bool `json:"enabled"`
 	// One of the following (not both):
 	Effort    string `json:"effort,omitempty"`     // Can be "high", "medium", or "low" (OpenAI-style)
 	MaxTokens int    `json:"max_tokens,omitempty"` // Specific token limit (Anthropic-style)