Improve configuration saving for AI models in settings

Update the OpenRouter configuration route to handle updates more gracefully, allowing API keys to remain unchanged if not explicitly provided.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ae4037a0-2a6f-4530-9bac-79b543286bda
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/397bca8c-984f-43ff-841a-10897aeb8140/ae4037a0-2a6f-4530-9bac-79b543286bda/35Hxx7C

shared/schema.ts

@@ -226,6 +226,10 @@ export const insertOpenrouterConfigSchema = createInsertSchema(openrouterConfig)
   updatedAt: true,
 });
 
+export const updateOpenrouterConfigSchema = insertOpenrouterConfigSchema.partial({
+  apiKey: true,
+});
+
 // Types
 export type User = typeof users.$inferSelect;
 export type InsertUser = z.infer<typeof insertUserSchema>;