feat: sprints with burndown and carry-over

Plan sprints with dates and a goal, run one at a time per project, and
put tickets in them from the ticket page. The Sprints tab follows the one
under way with its progress and a burndown in tickets or points against
the ideal line. Closing a sprint sends what was left to the next one or
back to the backlog; the board can be filtered by sprint.

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

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

@@ -285,6 +285,11 @@ export class BoardQueryDto {
   @IsBoolean()
   unassigned?: boolean;
 
+  @ApiPropertyOptional({ format: 'uuid', description: 'Only this sprint' })
+  @IsOptional()
+  @IsUUID()
+  sprintId?: string;
+
   @ApiPropertyOptional({ type: Number, default: 50, minimum: 1, maximum: 200 })
   @IsOptional()
   @Type(() => Number)
@@ -451,6 +456,17 @@ export class IssueSearchQueryDto extends PageQueryDto {
   @IsString()
   parent?: string;
 
+  @ApiPropertyOptional({ format: 'uuid', description: 'Only this sprint' })
+  @IsOptional()
+  @IsUUID()
+  sprintId?: string;
+
+  @ApiPropertyOptional({ description: 'Only tickets in no sprint' })
+  @IsOptional()
+  @Transform(toBoolean)
+  @IsBoolean()
+  noSprint?: boolean;
+
   @ApiPropertyOptional({
     enum: IssueSort,
     enumName: 'IssueSort',
@@ -819,6 +835,66 @@ export class CreateReleaseDto {
 
 export class UpdateReleaseDto extends PartialType(CreateReleaseDto) {}
 
+const DAY = /^\d{4}-\d{2}-\d{2}$/;
+
+export class CreateSprintDto {
+  @ApiProperty({ example: 'Sprint 14', maxLength: 80 })
+  @IsString()
+  @MinLength(1)
+  @MaxLength(80)
+  name!: string;
+
+  @ApiPropertyOptional({
+    type: String,
+    nullable: true,
+    maxLength: 500,
+    example: 'Pagos con tarjeta en producción',
+  })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
+  goal?: string | null;
+
+  @ApiProperty({ format: 'date', example: '2026-10-12' })
+  @Matches(DAY)
+  startDate!: string;
+
+  @ApiProperty({
+    format: 'date',
+    example: '2026-10-23',
+    description: 'Last day, included',
+  })
+  @Matches(DAY)
+  endDate!: string;
+}
+
+export class UpdateSprintDto extends PartialType(CreateSprintDto) {}
+
+export class CloseSprintDto {
+  @ApiPropertyOptional({
+    type: String,
+    nullable: true,
+    format: 'uuid',
+    description:
+      'Open sprint of the same project that takes the unfinished tickets; null or absent: back to the backlog',
+  })
+  @IsOptional()
+  @IsUUID()
+  carryOverTo?: string | null;
+}
+
+export class SetIssueSprintDto {
+  @ApiProperty({
+    type: String,
+    nullable: true,
+    format: 'uuid',
+    description: 'Open sprint of the project, or null for the backlog',
+  })
+  @ValidateIf((dto: SetIssueSprintDto) => dto.sprintId !== null)
+  @IsUUID()
+  sprintId!: string | null;
+}
+
 export class PublishReleaseDto {
   @ApiPropertyOptional({
     type: Boolean,