feat(tahesab): import and refresh customers at chosen hours

Each connection can set how many times a day and at which Tehran hours the server pulls Tahesab customers, including name updates for people already linked.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/integrations/tahesab/dto.ts

@@ -86,6 +86,16 @@ export class UpdateTahesabConnectionDto {
   @IsOptional()
   @IsBoolean()
   allowInsecureTls?: boolean;
+
+  /** ساعت‌های ۰ تا ۲۳. آرایهٔ خالی یعنی خاموش. */
+  @IsOptional()
+  @IsArray()
+  @ArrayMaxSize(6)
+  @Type(() => Number)
+  @IsInt({ each: true })
+  @Min(0, { each: true })
+  @Max(23, { each: true })
+  customerSyncHours?: number[];
 }
 
 export class ManualLinkDto {