feat: 设置页新增模型卡片，支持为7种能力配置默认模型

src/shared/api.ts

@@ -237,8 +237,21 @@ export type ProviderType = "anthropic" | "openai" | "openai-compatible";
 
 export type RuntimeMode = "development" | "production" | "test";
 
+/** 模型能力到默认模型 ID 的映射，用于后台自动流程 */
+export interface DefaultModelSettings {
+  /** 文本能力，覆盖 text + reasoning */
+  text?: string | null;
+  imageRecognition?: string | null;
+  audioRecognition?: string | null;
+  videoRecognition?: string | null;
+  imageGeneration?: string | null;
+  audioGeneration?: string | null;
+  videoGeneration?: string | null;
+}
+
 export interface SettingsData {
   compact?: boolean;
+  defaultModels?: DefaultModelSettings;
   theme: ThemePreference;
 }