fix: 切换 Provider 后不生效 + Ollama 模式 API Key 输入框仍显示

1. reloadAdapter 加 try-catch: 配置中间状态 createAdapter 抛异常时不阻断 IPC, 记录日志即可

2. sendMessage 时兜底调用 reloadAdapter: 确保每次发消息用最新 adapter, 不依赖 config:set 的逐字段 reload

3. Ollama 模式隐藏 API Key 输入框, 切换到 Ollama 时自动清空旧 key

4. 切换 Provider 时自动填充默认 URL（仅旧 URL 为默认值或空时）

electron/main.ts

@@ -230,15 +230,20 @@ async function initialize(): Promise<void> {
 
   // ===== 热重载 Adapter 回调（设置变更时触发）=====
   const reloadAdapter = () => {
-    const newAdapter = createAdapter();
-    agentLoop.setAdapter(newAdapter);
-    // Provider 切换时同步 contextLength：仅 Ollama 使用 numCtx 作为有效上下文窗口
-    const provider = configService.get<string>('llm.provider') ?? '';
-    if (provider === 'ollama') {
-      const numCtx = configService.get<number>('ollama.numCtx');
-      agentLoop.updateConfig({ contextLength: numCtx ?? undefined });
-    } else {
-      agentLoop.updateConfig({ contextLength: undefined });
+    try {
+      const newAdapter = createAdapter();
+      agentLoop.setAdapter(newAdapter);
+      // Provider 切换时同步 contextLength：仅 Ollama 使用 numCtx 作为有效上下文窗口
+      const provider = configService.get<string>('llm.provider') ?? '';
+      if (provider === 'ollama') {
+        const numCtx = configService.get<number>('ollama.numCtx');
+        agentLoop.updateConfig({ contextLength: numCtx ?? undefined });
+      } else {
+        agentLoop.updateConfig({ contextLength: undefined });
+      }
+      log.info(`[CONFIG] Adapter reloaded: provider=${provider}`);
+    } catch (err) {
+      log.error(`[CONFIG] Failed to reload adapter: ${(err as Error).message}`);
     }
   };