Enhance credential management and testing functionality

- Introduce new fields for voice, speed, and language in the AssistantConfig and ProviderCredential models to support TTS and ASR configurations.
- Update the database schema and seeding script to accommodate the new fields, ensuring backward compatibility.
- Implement credential testing endpoints and logic to validate OpenAI-compatible credentials, enhancing user experience and reliability.
- Modify frontend components to include new fields in the credential forms and improve connection testing feedback.
- Refactor related services and API interactions to support the new credential testing feature.

frontend/src/lib/api.ts

@@ -20,6 +20,9 @@ export type Credential = {
   interfaceType: InterfaceType;
   apiUrl: string;
   apiKey: string;
+  voice: string;
+  speed: number;
+  language: string;
   isDefault: boolean;
 };
 
@@ -34,6 +37,25 @@ export type CredentialUpsert = {
   isDefault: boolean;
 };
 
+export type CredentialTestRequest = Pick<
+  CredentialUpsert,
+  | "modelId"
+  | "type"
+  | "interfaceType"
+  | "apiUrl"
+  | "apiKey"
+  | "voice"
+  | "speed"
+  | "language"
+>;
+
+export type CredentialTestResult = {
+  ok: boolean;
+  latencyMs: number | null;
+  message: string;
+  detail: string;
+};
+
 async function request<T>(path: string, init?: RequestInit): Promise<T> {
   const res = await fetch(`${API_BASE}${path}`, {
     headers: { "Content-Type": "application/json" },
@@ -66,6 +88,14 @@ export const credentialsApi = {
       method: "PUT",
       body: JSON.stringify(body),
     }),
+  test: (body: CredentialTestRequest, id?: string) =>
+    request<CredentialTestResult>(
+      id ? `/api/credentials/${id}/test` : "/api/credentials/test",
+      {
+        method: "POST",
+        body: JSON.stringify(body),
+      },
+    ),
   // 服务端整行复制(含真 key,密钥不经浏览器)
   duplicate: (id: string) =>
     request<Credential>(`/api/credentials/${id}/duplicate`, { method: "POST" }),