feat: work-in-progress limits and swimlanes on the board

Each status can carry a WIP limit in the project settings; the board shows
it next to the count, marks a column that goes over it and says so when a
card is dropped there. The board can also be grouped in rows by person,
epic, priority or type, remembered per browser.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/presenters/src/lib/http/dto/responses.dto.ts

@@ -39,6 +39,12 @@ export class WorkflowStatusDto {
   requiresReason!: boolean;
   @ApiProperty({ description: 'No new tickets or transitions into it' })
   archived!: boolean;
+  @ApiProperty({
+    type: Number,
+    nullable: true,
+    description: 'Work-in-progress limit (a warning, not a lock)',
+  })
+  wipLimit!: number | null;
 }
 
 export class StatusTransitionsDto {