fix(config): 保存不再误删 CLI 后加的顶层配置节 + 未知供应商类型原样保留

- 导出 stale-key 清理增加导入基线（imported_section_keys）：CLI 在导入后
  新增的顶层节（kimi-code 0.38+ 的 [task]/[swarm]/[cron] 等）在保存时
  原样保留；用户在 UI 显式删除的节仍被移除；空基线（SQLite 快照恢复）
  不删任何键（安全退化）
- ProviderType 增加 Unknown(String) 变体，手写 serde 保持纯字符串线格式，
  上游新增的 type 值往返不再被改写为 kimi；SQLite 快照恢复路径同步修复；
  模型发现对未知类型返回明确错误，不再误用 KIMI_API_KEY
- 新增 3 个往返测试（106 个 Rust 测试全绿），前端 tsc/vitest 通过

src/components/ProviderEdit.tsx

@@ -54,6 +54,8 @@ function defaultBaseUrl(agent: Agent, type: ProviderType): string {
       case "anthropic":
       case "vertexai":
         return "";
+      default:
+        return "";
     }
   }
   // Pi defaults
@@ -68,6 +70,8 @@ function defaultBaseUrl(agent: Agent, type: ProviderType): string {
     case "anthropic":
     case "vertexai":
       return "";
+    default:
+      return "";
   }
 }
 
@@ -307,6 +311,11 @@ export function ProviderEdit({
                           {t}
                         </option>
                       ))}
+                      {!PROVIDER_TYPES.includes(provider.provider_type) && (
+                        <option value={provider.provider_type}>
+                          {t("apiFormatUnknown", { type: provider.provider_type })}
+                        </option>
+                      )}
                     </select>
                   </div>
                 </div>

src/i18n/en.ts

@@ -74,6 +74,7 @@ export const enTranslations: Record<TranslationKey, string> = {
   kimiOAuthStart: "Start sign-in",
   apiSettings: "API Settings",
   apiFormat: "API Format",
+  apiFormatUnknown: "Unknown format ({type}, kept verbatim)",
   authField: "Auth Field",
   apiKey: "API Key",
   getApiKeyLink: "Get API Key",

src/i18n/zh.ts

@@ -72,6 +72,7 @@ export const zhTranslations = {
   kimiOAuthStart: "开始登录",
   apiSettings: "API 设置",
   apiFormat: "API 格式",
+  apiFormatUnknown: "未知格式（{type}，原样保留）",
   authField: "认证字段",
   apiKey: "API Key",
   getApiKeyLink: "获取 API Key",

src/types/index.ts

@@ -6,7 +6,9 @@ export type ProviderType =
   | "openai"
   | "openai_responses"
   | "google-genai"
-  | "vertexai";
+  | "vertexai"
+  /** Any other string the CLI writes — preserved verbatim on round-trip. */
+  | (string & {});
 
 export interface Provider {
   name: string;
@@ -62,6 +64,12 @@ export interface Config {
   providers: Record<string, Provider>;
   models: Record<string, Model>;
   raw_other?: unknown;
+  /**
+   * Top-level section keys captured at import time by the Rust side.
+   * Export drops only baseline keys absent from raw_other (sections the
+   * user removed in the UI); CLI-added sections are preserved.
+   */
+  imported_section_keys?: string[];
 }
 
 /**