feat(ai-config): validate bindings before save

apps/api/src/ai/ai.controller.ts

@@ -15,7 +15,8 @@ import {
   AiChatResponse,
   AiService,
   ListAiBindingsResponse,
-  ListAiUsageLogsResponse
+  ListAiUsageLogsResponse,
+  TestAiBindingResponse
 } from "./ai.service";
 
 @Controller("ai")
@@ -45,6 +46,14 @@ export class AiController {
     return this.aiService.upsertBinding(this.resolveUserId(userIdHeader), body);
   }
 
+  @Post("bindings/test")
+  async testBinding(
+    @Headers("x-user-id") userIdHeader: string | string[] | undefined,
+    @Body() body: UpsertAiProviderBindingDto
+  ): Promise<TestAiBindingResponse> {
+    return this.aiService.testBinding(this.resolveUserId(userIdHeader), body);
+  }
+
   @Post("chat")
   async chat(
     @Headers("x-user-id") userIdHeader: string | string[] | undefined,