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/requests.dto.ts

@@ -142,6 +142,18 @@ export class WorkflowStatusBodyDto {
   @IsOptional()
   @IsBoolean()
   archived = false;
+  @ApiPropertyOptional({
+    type: Number,
+    nullable: true,
+    minimum: 1,
+    maximum: 999,
+    description: 'Work-in-progress limit (null: none)',
+  })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  @Max(999)
+  wipLimit?: number | null;
 }
 
 export class StatusTransitionsBodyDto {