chore: simplify model yaml (#308)

backend/conf/model/template/model_template_gemini.yaml

@@ -88,7 +88,6 @@ default_parameters:
             zh: 输入及输出设置
             en: Input and output settings
 meta:
-    name: Gemini-2.5-Flash
     protocol: gemini
     capability:
         function_call: true
@@ -107,7 +106,7 @@ meta:
         reasoning: true
         prefill_response: true
     conn_config:
-        base_url: ""
+        base_url: "https://generativelanguage.googleapis.com/"
         api_key: ""
         timeout: 0s
         model: gemini-2.5-flash
@@ -118,11 +117,6 @@ meta:
         top_p: 1
         top_k: 0
         stop: []
-        openai: null
-        claude: null
-        ark: null
-        deepseek: null
-        qwen: null
         gemini:
             backend: 0
             project: ""