Fixed: #339

**feat(handlers, executor): add Gemini 3 Pro Preview support and refine Claude system instructions**

- Added support for the new "Gemini 3 Pro Preview" action in Gemini handlers, including detailed metadata and configuration.
- Removed redundant `cache_control` field from Claude system instructions for cleaner payload structure.

internal/runtime/executor/claude_executor.go

@@ -679,7 +679,7 @@ func claudeCreds(a *cliproxyauth.Auth) (apiKey, baseURL string) {
 
 func checkSystemInstructions(payload []byte) []byte {
 	system := gjson.GetBytes(payload, "system")
-	claudeCodeInstructions := `[{"type":"text","text":"You are Claude Code, Anthropic's official CLI for Claude.","cache_control":{"type":"ephemeral"}}]`
+	claudeCodeInstructions := `[{"type":"text","text":"You are Claude Code, Anthropic's official CLI for Claude."}]`
 	if system.IsArray() {
 		if gjson.GetBytes(payload, "system.0.text").String() != "You are Claude Code, Anthropic's official CLI for Claude." {
 			system.ForEach(func(_, part gjson.Result) bool {

sdk/api/handlers/gemini/gemini_handlers.go

@@ -69,6 +69,27 @@ func (h *GeminiAPIHandler) GeminiGetHandler(c *gin.Context) {
 		return
 	}
 	switch request.Action {
+	case "gemini-3-pro-preview":
+		c.JSON(http.StatusOK, gin.H{
+			"name":             "gemini-3-pro-preview",
+			"version":          "3",
+			"displayName":      "Gemini 3 Pro Preview",
+			"description":      "Gemini 3 Pro Preview",
+			"inputTokenLimit":  1048576,
+			"outputTokenLimit": 65536,
+			"supportedGenerationMethods": []string{
+				"generateContent",
+				"countTokens",
+				"createCachedContent",
+				"batchGenerateContent",
+			},
+			"temperature":    1,
+			"topP":           0.95,
+			"topK":           64,
+			"maxTemperature": 2,
+			"thinking":       true,
+		},
+		)
 	case "gemini-2.5-pro":
 		c.JSON(http.StatusOK, gin.H{
 			"name":             "models/gemini-2.5-pro",