feat: add Gemini preset template for LLM settings (#97)

* feat: add Gemini preset template for LLM settings

* docs: add comment explaining Gemini /openai suffix requirement

* feat: update Gemini preset to use latest 3-pro and 3-flash models

* docs: improve comment to reference backend client.py implementation

web/src/components/game/panels/system/LLMConfigPanel.vue

@@ -50,6 +50,16 @@ const presets = computed(() => [
     model_name: 'anthropic/claude-3.5-sonnet',
     fast_model_name: 'google/gemini-3-flash'
   },
+  {
+    name: t('llm.presets.gemini'),
+    // Note: The `/openai` suffix is required to use Google's OpenAI-compatible API.
+    // Our backend (src/utils/llm/client.py) uses OpenAI-compatible format with
+    // Bearer token auth and /chat/completions endpoint, so we need this suffix
+    // to make Google API accept OpenAI-style requests instead of native Gemini format.
+    base_url: 'https://generativelanguage.googleapis.com/v1beta/openai/',
+    model_name: 'gemini-3-pro-preview',
+    fast_model_name: 'gemini-3-flash-preview'
+  },
   {
     name: t('llm.presets.ollama'),
     base_url: 'http://localhost:11434/v1',
@@ -286,6 +296,7 @@ onMounted(() => {
                <li><a href="https://platform.deepseek.com/" target="_blank">{{ t('llm.help_links.deepseek') }}</a></li>
                <li><a href="https://openrouter.ai/" target="_blank">{{ t('llm.help_links.openrouter') }}</a></li>
                <li><a href="https://cloud.siliconflow.cn/" target="_blank">{{ t('llm.help_links.siliconflow') }}</a></li>
+               <li><a href="https://aistudio.google.com/" target="_blank">{{ t('llm.help_links.gemini') }}</a></li>
             </ul>
           </div>
 

web/src/locales/en-US.json

@@ -109,13 +109,15 @@
       "deepseek": "DeepSeek",
       "siliconflow": "SiliconFlow",
       "openrouter": "OpenRouter",
+      "gemini": "Gemini",
       "ollama": "Ollama (Local)"
     },
     "help_links": {
       "qwen": "Aliyun Bailian (Qwen / Recommended)",
       "deepseek": "DeepSeek Platform (Fast & Cheap)",
       "openrouter": "OpenRouter (All-in-one, Recommended)",
-      "siliconflow": "SiliconFlow (Domestic Aggregation)"
+      "siliconflow": "SiliconFlow (Domestic Aggregation)",
+      "gemini": "Google AI Studio (Gemini)"
     }
   },
   "game_start": {

web/src/locales/zh-CN.json

@@ -109,13 +109,15 @@
       "deepseek": "DeepSeek",
       "siliconflow": "硅基流动",
       "openrouter": "OpenRouter",
+      "gemini": "Gemini",
       "ollama": "Ollama (本地)"
     },
     "help_links": {
       "qwen": "阿里云百炼 (Qwen / 最推荐)",
       "deepseek": "DeepSeek 开放平台 (国内推荐，便宜)",
       "openrouter": "OpenRouter (全机型聚合，推荐)",
-      "siliconflow": "硅基流动 (国内聚合)"
+      "siliconflow": "硅基流动 (国内聚合)",
+      "gemini": "Google AI Studio (Gemini)"
     }
   },
   "game_start": {