add clear username flag

server/src/api/validation/proxyValidation.ts

@@ -14,9 +14,9 @@ export const createProxyBodyValidation = z.object({
 	password: z.string().optional(),
 });
 
-// Empty/absent password keeps doesn't delete, only clearPassword: true does.
 export const editProxyBodyValidation = createProxyBodyValidation.extend({
 	clearPassword: z.boolean().optional(),
+	clearUsername: z.boolean().optional(),
 });
 
 export const getProxyByIdParamValidation = z.object({